I've had my Q5 for just over two years and have been absolutely delighted with it.However, Within a month of having it, I noticed a slight problem in that it slipped out of reverse gear if you were going up an incline for more than 50 or so yards at medium pace. This situation only occurred very occasionally and I tended to forget about the it until it happened the next time. I mentioned it in my first service (Mar 2011) and the engineer at the time wasn't able to replicate the problem. It happened a few times over the next 12 months but was quickly forgotten. It's just had it's second service (20,000 miles) and I thought that as the warranty only had a year to go I'd better sort it out. This time, I took the engineer out myself and he was pretty puzzled and said that he had never heard of this problem before. I have been booked in next month to have the gearbox taken out and repaired which will leave me without the car for a "week to ten days". When i asked why they needed it for so long, I was told that they would have to take the gearbox out and check it over and then it would take a few days for parts to arrive after which they would need more time to put it back together and refit it. I think they should fit a new gearbox but I am no expert and I'd be interested to know if anybody else has had this or similar problems and how it was tackled. I would be grateful for any comments.