Hi,
I don't know if this will help you but you may give it a try anyway.
I had a similar problem only that my car used to open itself after a while. Eventually I spoted the problem: the wires were damaged in the upper left part of the tailgate. Somehow in time they got pressed by the tailgate when closing. I just had to solder the wires back and redo the isolation and the problem was gone.
Goog luck !
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