diff --git a/prof.supp b/prof.supp
index 36f9ef71..c2f7f59c 100644
--- a/prof.supp
+++ b/prof.supp
@@ -5,7 +5,7 @@
 #
 # This file is a combination of our own rules and
 # * the glib2 suppressions file that usually can be found at /usr/share/glib-2.0/valgrind/glib.supp
-# * python suppressions file from http://svn.python.org/projects/python/trunk/Misc/valgrind-python.supp
+# * python suppressions file from https://github.com/python/cpython/blob/main/Misc/valgrind-python.supp
 #
 
 {
@@ -1557,6 +1557,10 @@
 	...
 	fun:xdg_mime_init
 }
+
+# Python Valgrind .supp start
+# taken from https://github.com/python/cpython/blob/main/Misc/valgrind-python.supp
+
 #
 # This is a valgrind suppression file that should be used when using valgrind.
 #
@@ -1654,6 +1658,49 @@
    fun:COMMENT_THIS_LINE_TO_DISABLE_LEAK_WARNING
 }
 
+#
+# Leaks: dlopen() called without dlclose()
+#
+
+{
+   dlopen() called without dlclose()
+   Memcheck:Leak
+   fun:malloc
+   fun:malloc
+   fun:strdup
+   fun:_dl_load_cache_lookup
+}
+{
+   dlopen() called without dlclose()
+   Memcheck:Leak
+   fun:malloc
+   fun:malloc
+   fun:strdup
+   fun:_dl_map_object
+}
+{
+   dlopen() called without dlclose()
+   Memcheck:Leak
+   fun:malloc
+   fun:*
+   fun:_dl_new_object
+}
+{
+   dlopen() called without dlclose()
+   Memcheck:Leak
+   fun:calloc
+   fun:*
+   fun:_dl_new_object
+}
+{
+   dlopen() called without dlclose()
+   Memcheck:Leak
+   fun:calloc
+   fun:*
+   fun:_dl_check_map_versions
+}
+
+
 #
 # Non-python specific leaks
 #
@@ -2048,6 +2095,10 @@
    fun:PyUnicode_FSConverter
 }
 
+# Python Valgrind .supp end
+
+
+
 # Actual GTK things
 {
   GtkWidgetClass action GPtrArray
diff --git a/src/database.c b/src/database.c
index 5ceb6357..6abdb6b8 100644
--- a/src/database.c
+++ b/src/database.c
@@ -320,7 +320,7 @@ log_database_get_limits_info(const gchar* const contact_barejid, gboolean is_las
 // null the current time is used. from_start gets first few messages if true
 // otherwise the last ones. Flip flips the order of the results
 db_history_result_t
-log_database_get_previous_chat(const gchar* const contact_barejid, const char* start_time, char* end_time, gboolean from_start, gboolean flip, GSList** result)
+log_database_get_previous_chat(const gchar* const contact_barejid, const gchar* start_time, const gchar* end_time, gboolean from_start, gboolean flip, GSList** result)
 {
     if (!g_chatlog_database) {
         log_warning("log_database_get_previous_chat() called but db is not initialized");
@@ -337,7 +337,7 @@ log_database_get_previous_chat(const gchar* const contact_barejid, const char* s
     gchar* sort1 = from_start ? "ASC" : "DESC";
     gchar* sort2 = !flip ? "ASC" : "DESC";
     GDateTime* now = g_date_time_new_now_local();
-    auto_gchar gchar* end_date_fmt = end_time ? end_time : g_date_time_format_iso8601(now);
+    auto_gchar gchar* end_date_fmt = end_time ? g_strdup(end_time) : g_date_time_format_iso8601(now);
     auto_sqlite gchar* query = sqlite3_mprintf("SELECT * FROM ("
                                                "SELECT COALESCE(B.`message`, A.`message`) AS message, "
                                                "A.`timestamp`, A.`from_jid`, A.`from_resource`, A.`to_jid`, A.`to_resource`, A.`type`, A.`encryption`, A.`stanza_id` FROM `ChatLogs` AS A "
diff --git a/src/database.h b/src/database.h
index 4b84e722..e6c28359 100644
--- a/src/database.h
+++ b/src/database.h
@@ -53,7 +53,7 @@ void log_database_add_incoming(ProfMessage* message);
 void log_database_add_outgoing_chat(const char* const id, const char* const barejid, const char* const message, const char* const replace_id, prof_enc_t enc);
 void log_database_add_outgoing_muc(const char* const id, const char* const barejid, const char* const message, const char* const replace_id, prof_enc_t enc);
 void log_database_add_outgoing_muc_pm(const char* const id, const char* const barejid, const char* const message, const char* const replace_id, prof_enc_t enc);
-db_history_result_t log_database_get_previous_chat(const gchar* const contact_barejid, const char* start_time, char* end_time, gboolean from_start, gboolean flip, GSList** result);
+db_history_result_t log_database_get_previous_chat(const gchar* const contact_barejid, const gchar* start_time, const gchar* end_time, gboolean from_start, gboolean flip, GSList** result);
 ProfMessage* log_database_get_limits_info(const gchar* const contact_barejid, gboolean is_last);
 void log_database_close(void);
 
diff --git a/src/plugins/python_plugins.c b/src/plugins/python_plugins.c
index 8cd721df..13278750 100644
--- a/src/plugins/python_plugins.c
+++ b/src/plugins/python_plugins.c
@@ -900,6 +900,8 @@ _python_type_error(ProfPlugin* plugin, char* hook, char* type)
     g_string_free(err_msg, TRUE);
 }
 
+// Converts a Python string or None result to a C string and decreases the Python object's reference count.
+// If the result is NULL, or not a string/unicode/bytes/None, logs an error and returns NULL.
 static char*
 _handle_string_or_none_result(ProfPlugin* plugin, PyObject* result, char* hook)
 {
@@ -910,18 +912,16 @@ _handle_string_or_none_result(ProfPlugin* plugin, PyObject* result, char* hook)
     }
 #ifdef PY_IS_PYTHON3
     if (result != Py_None && !PyUnicode_Check(result) && !PyBytes_Check(result)) {
-        allow_python_threads();
-        _python_type_error(plugin, hook, "string, unicode or None");
-        return NULL;
-    }
 #else
     if (result != Py_None && !PyUnicode_Check(result) && !PyString_Check(result)) {
+#endif
+        Py_XDECREF(result);
         allow_python_threads();
         _python_type_error(plugin, hook, "string, unicode or None");
         return NULL;
     }
-#endif
     char* result_str = python_str_or_unicode_to_string(result);
+    Py_XDECREF(result);
     allow_python_threads();
     return result_str;
 }
diff --git a/src/ui/chatwin.c b/src/ui/chatwin.c
index fc14f0a5..922b8523 100644
--- a/src/ui/chatwin.c
+++ b/src/ui/chatwin.c
@@ -40,6 +40,7 @@
 #include <stdlib.h>
 #include <assert.h>
 
+#include "glib.h"
 #include "xmpp/chat_session.h"
 #include "window_list.h"
 #include "xmpp/roster_list.h"
@@ -585,10 +586,12 @@ _chatwin_history(ProfChatWin* chatwin, const char* const contact_barejid)
 // first entry's timestamp in the buffer is used. Flip true to prepend to buffer.
 // Timestamps should be in iso8601
 db_history_result_t
-chatwin_db_history(ProfChatWin* chatwin, const char* start_time, char* end_time, gboolean flip)
+chatwin_db_history(ProfChatWin* chatwin, const gchar* start_time, const gchar* end_time, gboolean flip)
 {
-    if (!end_time) {
-        end_time = buffer_size(((ProfWin*)chatwin)->layout->buffer) == 0 ? NULL : g_date_time_format_iso8601(buffer_get_entry(((ProfWin*)chatwin)->layout->buffer, 0)->time);
+    auto_gchar gchar* _end_time = NULL;
+    if (!end_time && buffer_size(((ProfWin*)chatwin)->layout->buffer) > 0) {
+        _end_time = g_date_time_format_iso8601(buffer_get_entry(((ProfWin*)chatwin)->layout->buffer, 0)->time);
+        end_time = _end_time;
     }
 
     GSList* history = NULL;
diff --git a/src/ui/ui.h b/src/ui/ui.h
index 1eafd743..97b7c32e 100644
--- a/src/ui/ui.h
+++ b/src/ui/ui.h
@@ -146,7 +146,7 @@ void chatwin_set_incoming_char(ProfChatWin* chatwin, const char* const ch);
 void chatwin_unset_incoming_char(ProfChatWin* chatwin);
 void chatwin_set_outgoing_char(ProfChatWin* chatwin, const char* const ch);
 void chatwin_unset_outgoing_char(ProfChatWin* chatwin);
-db_history_result_t chatwin_db_history(ProfChatWin* chatwin, const char* start_time, char* end_time, gboolean flip);
+db_history_result_t chatwin_db_history(ProfChatWin* chatwin, const gchar* start_time, const gchar* end_time, gboolean flip);
 
 // MUC window
 ProfMucWin* mucwin_new(const char* const barejid);
diff --git a/src/ui/window.c b/src/ui/window.c
index 6489142a..5dc81391 100644
--- a/src/ui/window.c
+++ b/src/ui/window.c
@@ -710,20 +710,22 @@ win_page_down(ProfWin* window, int scroll_size)
     // Scrolled down after reaching the bottom of the page
     if ((*page_start > total_rows - page_space || (*page_start == page_space && *page_start >= total_rows)) && window->type == WIN_CHAT) {
         int bf_size = buffer_size(window->layout->buffer);
-        if (bf_size > 0) {
+        if (bf_size > 0 && *scroll_state != WIN_SCROLL_REACHED_BOTTOM) {
+            // How many lines are left until end of the screen
+            int current_offset = total_rows - *page_start;
+            GDateTime* now = g_date_time_new_now_local();
             ProfBuffEntry* last_entry = buffer_get_entry(window->layout->buffer, bf_size - 1);
             auto_gchar gchar* start = g_date_time_format_iso8601(last_entry->time);
-            GDateTime* now = g_date_time_new_now_local();
-            gchar* end_date = g_date_time_format_iso8601(now);
-            g_date_time_unref(now);
-            if (*scroll_state != WIN_SCROLL_REACHED_BOTTOM && !chatwin_db_history((ProfChatWin*)window, start, end_date, FALSE)) {
+            auto_gchar gchar* end_date = g_date_time_format_iso8601(now);
+            db_history_result_t db_response = chatwin_db_history((ProfChatWin*)window, start, end_date, FALSE);
+            if (db_response == DB_RESPONSE_EMPTY)
                 *scroll_state = WIN_SCROLL_REACHED_BOTTOM;
-            } else if (*scroll_state == WIN_SCROLL_REACHED_BOTTOM) {
-                g_free(end_date);
-            }
 
-            int offset = last_entry->y_end_pos - 1;
-            *page_start = offset - page_space + scroll_size;
+            // similar to page_up (see explanation there)
+            // Get offset of the message that was the latest prior to loading messages from the DB
+            int original_pos = last_entry->y_end_pos;
+            *page_start = original_pos - current_offset;
+            g_date_time_unref(now);
         }
     }
 
diff --git a/src/xmpp/iq.c b/src/xmpp/iq.c
index a8a485b2..b3a1bf98 100644
--- a/src/xmpp/iq.c
+++ b/src/xmpp/iq.c
@@ -2752,6 +2752,22 @@ iq_mam_request(ProfChatWin* win, GDateTime* enddate)
     return;
 }
 
+// Trim the last 3 characters from the datetime string to remove unwanted suffix (timezone offset)
+static void
+_truncate_datetime_suffix(gchar* str)
+{
+    if (!str) {
+        log_warning("_truncate_datetime_suffix(): unexpected null datetime string");
+        return;
+    }
+    size_t len = strlen(str);
+    if (len >= 3) {
+        str[len - 3] = '\0';
+    } else {
+        log_warning("_truncate_datetime_suffix(): unexpected short datetime string: %s", str);
+    }
+}
+
 static int
 _mam_rsm_id_handler(xmpp_stanza_t* const stanza, void* const userdata)
 {
@@ -2773,17 +2789,17 @@ _mam_rsm_id_handler(xmpp_stanza_t* const stanza, void* const userdata)
 
             buffer_remove_entry(window->layout->buffer, 0);
 
-            auto_char char* start_str = NULL;
+            auto_gchar gchar* start_str = NULL;
             if (data->start_datestr) {
-                start_str = strdup(data->start_datestr);
+                start_str = g_strdup(data->start_datestr);
                 // Convert to iso8601
-                start_str[strlen(start_str) - 3] = '\0';
+                _truncate_datetime_suffix(start_str);
             }
-            char* end_str = NULL;
+            auto_gchar gchar* end_str = NULL;
             if (data->end_datestr) {
-                end_str = strdup(data->end_datestr);
+                end_str = g_strdup(data->end_datestr);
                 // Convert to iso8601
-                end_str[strlen(end_str) - 3] = '\0';
+                _truncate_datetime_suffix(end_str);
             }
 
             if (is_complete || !data->fetch_next) {
diff --git a/src/xmpp/presence.c b/src/xmpp/presence.c
index 577a2e82..56cbb379 100644
--- a/src/xmpp/presence.c
+++ b/src/xmpp/presence.c
@@ -644,7 +644,7 @@ _available_handler(xmpp_stanza_t* const stanza)
         const char* account_name = session_get_account_name();
         int max_sessions = accounts_get_max_sessions(account_name);
         if (max_sessions > 0) {
-            const gchar* cur_resource = accounts_get_resource(account_name);
+            auto_gchar gchar* cur_resource = accounts_get_resource(account_name);
             int res_count = connection_count_available_resources();
             if (res_count > max_sessions && g_strcmp0(cur_resource, resource->name)) {
                 ProfWin* console = wins_get_console();