Had this problem on a 1990 Oldsmobile Cutlass Calais. Took it to an auto electric shop, and they pinpointed that the electric door lock module was bad, with bad contacts that were shorted out due to moisture.
After disassembling it and sanding the contacts and reassembling, I had no more problems with the random power door locks locking on me.
I since have sold the car and haven't heard about any more problems with that problem.
On a newer car than my 1990 Oldsmobile it can be the body control module, too.
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