I have a 2010 2.0 tdi A5 which has recently developed a really weird fault. I do the same commute to work every day and after roughly 10-15 minutes of driving, while I'm on the motorway, a vibration starts through the steering wheel along with a low frequency drone. At first I thought wheel balancing but it disappears after around a minute and doesn't come back for the rest of the journey (around 40 minutes). It doesn't seem to be speed related either as I've slowed down/sped up etc but still the same. I've also dipped the clutch to make sure it's not dual mass flywheel related. I had the wheels balanced as a matter of course but still no good. Really strange fault and quite annoying, anyone got any ideas ?