1994 Nissan 300ZX Door Locks Functioning on their own

This morning I pulled into the parking lot, parked, & turned my car off. I unlocked my driver's side door from the inside. The locks began to flip back and forth from unlock to lock several times. In fact, I was lucky to get the door open. I put my key back in and started my car again. The locks again began to flip back and forth again. I have left the doors unlocked at this point for fear that I wont be able to get back into the car.

Any ideas on what might cause the locks to malfunction? Fuses, Battery in the key fob?