I know of a couple reasons why the mirror folding messes up as I recently had a mirror unit replaced on a 2011 XC60 D3, and I quizzed the Volvo technician on the details afterwards.. Nice chap by all accounts!
The possible causes I've been told about are:
1) The wiring in the mirror assembly isn't able to take repeated flexing (a number of years worth), so the mirror folding action eventually fatigues the wiring and it snaps. This happened in my case and broke the folding mechanism and the heated mirror.
2) If the mirror was knocked beyond it's normal stopping point, the software that controls the folding can get out of sync and the mirror sensors/software need re-calibrating.
It sounds like option 2) for you if the mirror is still moving of it's own accord.
I'm guessing a dealer could put it right but I suspect they'll charge you an hour labour for the investigation and calibration (100 ish quid + VAT). Luckily I had a few days left on my warranty!
Best of luck!
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