Hi, my first post here. I have had my 56-reg Q7 for more than a year and I'm quite happy with it. A few weeks ago the boot lock started to rattle before the door opens. I press the button to open the boot, it makes a ra-ta-ta-ta noise and then opens fine. It closes fine. This happens only 3 times out of 4 boot openings. I cleaned and greased the bottom part of the locking mechanism but it didn't help. Audi dealer recommends changing the locking mechanism and the motor but I suspect there must be a cheaper option. The mechanism seems fine, I don't think it needs changing and it is possible the motor is fine as well. Any advice? Thanks.