I wonder if this could be related to the auto-relock feature that relocks the doors after about 15-20 seconds if you don't open a door. I've unlocked my doors with the remote and then opened the rear door to put packages away, and then had the doors relock before I could open the driver's door. I don't know if this feature can be disabled, but there could be some sensor or program in the computer getting bad info and engaging the locks. I wouldn't know how to troubleshoot this problem either. Reboot?
Gregg
2001 Proton Yellow #1379