Locking keys

[th3drow]

Ok when i turn my screen off with the power button sometimes everything is locked, and sometimes not. It seems like most of the time when i put the phone it my pocket , the screen will be on when i pull it out. And i can turn the screen off and press like 2 hardware buttons, or ever touch the screen and it will turn back on. Any clue why my buttons are locking when the screen is off? using juicy 4.4

thanks very much