I've had my Xf for just over a month now and I'm loving it. However there are a few niggles. Firstly the volume on the stereo reduces when reversing etc, and sometimes doesn't return to the original volume and I have to manually adjust it. Secondly I'm using a USB hard drive with all my MP3 files on it. Again it mostly works flawlessy, but on two occasions it seems to have forgotten where it was on returning to the car, and simply started playing the first track. And finally, my XF has a sunroof. The headlining around where the sunroof retracts squeaks and creaks a little. It is minor, but as the only creak in the whole car it's annoying. The car is still under manufacturers warranty until the 18th September, but is any messing around at this stage likely to just make the problem worse, and is something like this even covered by warranty. Thanks in advance for any advice. Graham