[Q] apps pauses automatically suddenly topic

I rooted my phone {max AX5 ICS} 1 month ago.. everything worked fine
but suddenly 1 week ago, all my apps started to pause whenever i m using them
for example: - if i m watchng movie in mx player and lock the screen,.. it will automatically unlock {it only happens when u unlock via unlock button in ur phone}.
also if i m playing a game a game say major mayhem or hill racing or ninja saga, the game will autmatically pause while i m playing
pls help me fastly.. i scanned my device with antivirus .. also i didnt freeze any app in my device.
also now gamecih app says "system deny to root" and it doesnot work.... it wrked for 3 weeks on my rooted phone, so there is no issue in my device.
dont know why it's happening... pls help..........................