Lock Screen Reverts to "Immediately" randomly

[Anthony Moor]

I've got a new HTC one with Android Jelly Bean 4.1.2. I've set the timeout time for the lock screen to a number of settings, usually 1 hour. However, after what seems to be a random period of time (12-24 hours or so) the phone resets the lock screen timeout to "immediately."

Has anyone else had this problem?