2007 Sierra Driver Door Locking Problem
 

I have a 2007 Sierra that suddenly will not let me out of the drivers door when the rig is shut off. When you roll the window down the outside door handle does not work either. I have tried manually locking and unlocking the doors with the switch on the door. The interior levers appear to move into the lock and unlock positions, but the door still will not open. When I restarted the engine and shut it off, then the door will open. Sometimes it takes a couple of engine re-starts before the door will open This is a serious safety concern. Has this happened to anyone else, and is there a recall or fix for this?