Problem with threads (probably)!!

Hi!
I make an application (a simple game) and i am using threads threads for the animation. In emulator my runs without any problem but when i run it in my phone (LG Optimus One) it crashes (usually after i restart it). And if it crashes and i try to restart it, it doesn't run again..I think that my problem is with threads but i am not sure and i can't find any solution..Does anybody same problem or a possible solution???