Model doesn't disappear when VuMark is off the screen

Hi, 

In Unity editor everything works fine but when i build and run app on android sometimes model doesn't disappear from the screen when VuMark is off the screen after a quick phone move.

Actually in Unity editor this happens sometimes as well but just for a very short period of time ( microseconds ) and then model disappear and on android model seems to float on the screen until VuMark is back on the screen.

Does anyone knows what can cause the problem?

ps. I found couple of similar problems on forum but none had a solution.

Would be very grateful for help.