You are probably correct that there is some sort of feedback telling the automated command to either stop, or is confusing it to tell the mirror to lower, this the jittery clicking for s few seconds.
On my vehicle, the auto-lower feature when in reverse feature is turned off, but the mirror continues to lower when in reverse for Driver 2 and then we get stuck in this cycle.
I do have a second passenger mirror that I bought years ago from member
@Drakito, so I will plug that in and see if it is a mirror limit switch issue before I bother to hard mount it.
It’ll be a few weeks to get to this, but I will report back and this thread can either be conclusive, or eliminate another possibility.