[Xman_NYC]

Recently my screen stopped automatically locking itself when the screen shut off, which would often lead to pocket dialing when the phone was in my pocket a button got pushed.

Here's how I fixed it:

You need a registry editor like PHM Registry Editor (I think I found that in this forum). Go to \HKCU\ControlPanel\Backlight\ and change the AutoDeviceLockEnable from 0 to 1 then soft reset the phone and you're done.