This is just a ridiculous lack of response from Microsoft. It is absolutely unacceptable that they've been receiving customer reports for 2 years and have done NOTHING. No replies, no solutions, nothing except telling people to reinstall windows or update drivers (which doesn't solve anything btw). I love the surface pro, but this is unacceptable for me. It's way too expensive to have this kind of flaw. I won't be buying any more Microsoft hardware because of this, and I want them to know that they're losing a customer here because of their utter incompetence.
I don't have anything new to add to the other responses, but I am reporting my case anyway to maybe increase the chance of someone at Microsoft doing something about this.
I have the seemingly random sticky trackpad on a Surface Pro 2017 with a signature type cover (actually my second one, because I returned the first one thinking it was a malfunction with the type cover, only to become extremely disappointed when I discovered it wasn't...). For me, the issue only occurs when the tablet is plugged in. I tried some of the solutions suggested here and none worked for me (except using the Surface on battery power, but I don't even consider that a solution).