well at the same time you are tightening up the door panel you are also flexing the conduit between the door and the A pillar, have you pulled out the loom through the conduit to see if any wire damage is contained within it... because that is the greatest wear and tear area .
note other
whilst doing all this ... you don't want the keyfob anywhere near the van,because as mentioned above that may be the cause.
also ... any handles that are stiff on the doors and not pushed in, will cause all doors to cycle to open, any fault on any door will also cause it to cycle to open.
all the best.mark


