Originally Posted by martysmartie

Assuming it's nothing to do with the car, i.e. it's not new, then check the vaccum hoses, they split, introducing an air leak.

Re the unlocking, it's a common problem that cars suffer, it sounds as if one of the "Masters is sticky", i.e. the driver or passenger door, when the C/L pulse times out, one of the motor is "Stuck in the middle" and so it simply reverts.

The remedy is to lubricate both locks.

Martin