Please perform the following steps to resolve the issue:
1- Settings > apps > tap on 3 dots (Upper right corner) > reset app preferences > reset.
2- Settings > apps > phone app > storage > clear cache > go back > force stop.
3- Clear the RAM memory of device (Settings > Device care > Memory > Clean Now).
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