The rear glass has shattered in my A5 convertible roof for no apparent reason whilst closing and certainly not through my own actions after all it operates by pressing a button!! Cost of replacement £5,000 +vat!!! Insurers will not accept claim as they say mechanical problem. Audi may not accept liability because car is 3 months outside of warranty. Has anyone else had this problem? I had an Audi A4 convertible for 8 years before and no problems so I know how to use the roof!! This should not happen with Audi Technology and don't know where this is going with them atm. New convertible owners beware!!