My safe will go through periods where the handle will not lock the safe, either door open or closed. I finally took off the inside cover to take a look at the locking mechanism. Nothing seems out of place, but sometimes the bolts will not stay engaged in the lock position. Opening is never a problem. The only troubleshooting stuff I find on the internet is about the electronic keypad. This is mechanical, not electrical. Any ideas out there in Glockland? Thanks!