Kellster

I have a 2021 GMC Sierra SLT and my tailgate was doing the same thing, only while parked. It seemed to be only when the key fob was away from truck for extended periods. Dealership had never heard about this(??), and couldn’t replicate the issue, of course. They did however, at that appointment, change out the entire tailgate handle due to a “short” and I am going on 2 weeks of it not happening since. It would do it to me daily for almost 2 weeks before I took it in. Hope this helps.