Door lock and unlocks while driving

The drivers side rear door locks when I drive but then it unlocks and continues to lock and unlock everytime I come to a stop or slow down. This is driving me crazy. Please don't say "TAKE IT TO THE DEALER"

It could be a bad connection or broken/frayed wire where the wiring harness goes from the body to the door at the hinges. Pull back the rubber boot & check them carefully.

Have someone how can verify over the phone that they are willing to work on Vaccuum locks, which is what your car has. They are a bitch to fix if you know nothing about them. Believe it or not, a lot of auto body places are good at that because they deal with wrecked cars and side impacts. You may want to check that out. an autobody place instead of a mechanic/ dealer/ auto shop