Choppy Screen after an hour of gameplay

Ever since the Pet update, the screen becomes choppy and items such as gems on the board or troops seem to disappear. some of the buttons like the settings button turns into PS4 buttons. It gets worse when I try to open settings. It seem to happen after 30 minutes to 1 hour or sometimes 2 hours of playing. The only way that i’ve been able to fix it is by restarting the game. Also, I lost 1 invasion sigil because of it.

Edit: I play on PC.