For the last two nights I was using my razr max and it kept locking on me. Every 3-15 seconds it would lock, i'd unlock it, and it'd lock again. I restarted it and it kept doing it. the next day it didn't do it, but it did that night. I had plenty of battery left. The only difference between night and day is that it has one of those rules set up to dim the screen and shut off the ringer between 9pm and 7am. Could that by why?