I have noticed something like that as well, seems to be coming from the drivers door panel (lower). Almost like a small ping pong ball / plastic type of sound. Haven't scheduled up a visit to the dealer yet, but will report back when I do.
Just wanted to post a follow up on this one, in case others have the issue. The first attempt at the dealer, they replaced a few clips in the door panel and added some foam, it didn't seem to help.
Second attempt at dealer, they took it for a couple quick test drives, and found the left side of the drivers seat base to be a little loose and squeaking. They took the seat out, then put it back in and torqued everything down.
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