In my case, it hapens most short after start the game/project (play). I now try to find out what is wrong. At moment it only hapen in one project. I did copy this project, and now i removing part by part, to find out what is causing it. Could be in projectiles, or maybe in the AI code i made. Just weird, that it not hapen in 4,11, with same project, but in 4,12 it freez the screen. Some times , after maybe 5 minuts, it short run a bit and get freez again.