That is very weird.
I'm not very good in troubleshooting, but since you have noticed it, was there a really bad weather in last few days with lots of heavy showers?? I know that they are pretty waterproof, but some things just give up one day.
Other thing I can suggest is I could send you my very good condition used mirror switch today via 1st class to see if it's not a mirror switch.
Just let me know and I will have it send ASAP 
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2006 D3 S8 5.2 V10
Ceramic Brakes, Bang&Olufsen, DTV, DAB, Rear Camera, BT, TPMS, Soft Close, Auto Boot, AMI , 4 Zone AC, Home Link, All Electric Blinds, Fingerprint, Ski Hatch, Black Extended Leather, Heated Sport Seats, Alacantra, Carbon Trim inc Aluminium Pack 2.
2015 A3 S line 1.4 TFSI - for the missus to keep her away from my car.
Standard S-line equipment, no extras.
2006 D3 A8 3.7 V8 - SOLD but not forgotten
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