This is a follow-up from a thread a few weeks ago - AMI Gremlin. After 25 days of ownership, my car has been back at the dealer's for 7 days, spread over three visits. Basically, my MMI doesn't work most of the time, but sometimes it does - and I had a flat battery once. On the first 2 visits they simply reset all the fault codes and it worked ... until the next day. When it happened the third time I threatened to reject the car as being of unsatisfactory quality and not fit for purpose. They acted quickly, took the car back and gave me a loaner. I got the diagnosis today - a faulty AMI unit. I was then given the news that AMIs are on back order and will take 5-7 days. OK I said, take the faulty AMI out, give me my car back and I'll come back again when the new unit arrives. "We'd rather not" was the reply. "We're happy for you to keep the loaner and your car is safe while it's with us". Why do you think they are reluctant to return my car? Is it a technical thing related to whatever devices are coded into the car? Is it because of the threatened rejection of the car and they'd rather keep it until it's fixed. I'd rather be driving an A5 than an A4, not that there's anything wrong with A4s. What if the new AMI takes even longer to arrive? On the other hand I want it fixed, and fixed properly? What would you do?