1994 Buick Somerset mileage: 85,000. As I am driving, my door lock actuators keep activating to lock the doors. They activate every 2-3 seconds. But sometimes they stop (and behave normal). Sometimes they seem to activate when I hit a bump, but other times I don't really hit any bumps when they activate. This occurs only while the car is moving. When stopped at an intersection, the locks don't do anything. I have not noticed any other problems locking or unlocking the doors - when the car is stopped/parked. Also, in conjunction with this, when stopped at an intersection, the interior dome light comes on. Then goes off once I start moving - but then the doors start locking again. Additionally, when I park and get out, the interior lights do not always go off - sometimes they stay on for many minutes, sometimes they go off in about 20 seconds (as normal). Sometimes re-closing the doors fix this, sometimes not. Any advice is much appreciated. Thank You