Ios Low Fps

Hello. What can cause extremely unstable FPS? which falls from 130 to 2, constantly every 1-3 seconds, and no matter what I change in the project settings, the result does not change, even if I set the resolution to 94X203 and Resolution scale 10%

absolutely empty project, absolutely empty level. (Mobile, Scalable)

Unreal Engine 5.0.3
Metal v2.4
IOS 15
Iphone 13 pro