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Ha, funny you mention the tail gate. It will not close "on its own" I have to slam it shut otherwise it remains slightly ajar. Also, I can hear some noise coming from the back (every 5 seconds or so) whereas it sounds like the tailgate motor is trying to do something......I just thought it was an "old car" issue.
Shutting and popping back up means something is blocking it from closing completely, like a cargo mat or piece of trim or misadjusted catch for the latch. The door stalling during the opening process is the indicator of a battery not supplying proper power.