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probably the glass itself or the 2 wires to the back of it

isn't anything daft in the manual about the switch needing to be central or anything daft like that is there ?
 
I had the exact same problem on my 2008 Leon after about 6 months (well I noticed it after 6 months, it may of never worked!). Dealer swapped the mirror glass under warranty at the next service, no problems since.