Android app freeze

I made simple minecraft like terrain generation. It is using threads and other stuff. It is working well on my pc computer, stable 600 fps on 2 core old cpu when displaying more than 2500 chunks(16x16x16), but when i build this app on my android phone i get 60 fps on start then it starting(after 2-3 seconds) to increase cpu usage from 16ms to over 800ms app freeze phone is restarting. I dont know what can be doing it. In editor everything work fine, on pc build too but android is crashing…

Try using the Unity Profiler to get more details: Unity - Manual: Profiler overview

It may help you understand whether you are CPU or GPU bound.