Q7_newbie

I bought a Q7 7 months ago its now just reaching 90000 miles. Within the past month two of the injector holding bolts have sheered off and the injectors have come out. 1 bolt I can understand that there is wear/vibration that will eventually weaken and snap but 2 within 1 month is a little hard to understand. Any ideas on if there might be a separate problem that is causing this to happen? Is there anything inside the piston that could cause that amount of force to rip the injectors out? Please any one got any ideas, willing to try anything dont really want the other 4 to go as its £500 a pop after getting an engineer to pull out the other half of the bolt in the socket. Cheers.

Hi all, Sorry if this is posted in the wrong place. I just traded my A5 for a Q7 and only just noticed that the bluetooth although works for phone calls wont allow me to play music through the bluetooth. It has the MMI 3G HDD (i believe as its got music box in). Do you know if I upgrade the MMI software it can use the bluetooth integration? Also any ideas how I can get DAB through it, seems I can get TV channels through it but not DAB. Didnt realise how much I would miss DAB.. Cheers