One Suggestion Bro, check with Default Theme.
Sometime we faced issue just becuase of Themes takes time to load.
If memory is full try to clean .
Also restart your phone once in a week, it really help.
Rest wait for update :)
Please perform the following steps to resolve the issue:
1- Settings > apps > tap on 3 dots > show system apps > phone app > storage > clear cache.
2- Clear the RAM memory of device (Settings > Device care > Memory > Clean Now).
3- Stop the background running app (Tap on the left soft key and close all the running apps).
4- Check for the latest device O/S (Settings > Software Update > Download updates manually).
For further assistance, register your concern in Samsung members app (Open Samsung members app>click on “+“icon>send feedback>Error report/ Ask Questions).
Team Samsung Members