Stutters and lags on a new tablet

Device info: Samsung galaxy tab s11 128gb.

The game runs smoothly for some time, but at some random point starts lagging, fps drops to like 3 to 5. Going out full screen mode sometimes helps for a minute, but it's  not comfortable to do it every minute. I'm pretty sure the device have enough performance to run this game. 

I've tried to reinstall, clear cache and app data, nothing helps