When moving, fps goes from 55 to 30 and to 15 and 10 at once

The game is very slow for me sometimes and it gets stuck and its fps goes down. When I move, the fps goes from 55 to 30 and to 15 and 10 at once. my device : android 11 name: Motorola one action core:8core &403MHZ -2.21ghz& ram:3.8 gb & storage :128 gb fix problems please I waiting for update thanks