Auto lock not working

[endaglo]

When i push the top button to put my X2 in standby/lock the screen it turns black like it should. But when i get a msg and hit the button again the lock screen is gone. battery pull wont correct the problem, nor will powering down...no new apps were installed to create the problem either. I took it to verizon and asked for a Droid user to help and they just said to do a factory reset. I refuse to do factory reset, because i hate having to reprogram my device every time it crashes from some bug, also hate having to reinstall ALL my apps. anyone know how to fix this??