Bob goes blank after loading main game screen.

[jmimohsin]

1. I am facing this issue when I call game screen than some time bob goes blank and everything works well and sometime any texture goes broad and looks roughly.
2. I open this game in my friend's mobile, it works well first time only but when I try to open it again (even removed from stack using home button) than it does not open and every time this happens. I have to press home screen than select game and than it starts.