Started up my S3 this morning and right from pull away it felt slow and awkward, no jerking, still smooth but lacking in power and unresponsive when trying to accelerate. Once on a main road I tried to put my foot down and it just slowly crept up in speed rather than it's normal "zooming off" response. Couldn't hear the turbo at all (normally can), stopped at a set of lights, so restarted the car, which didn't help. Then after about 5mins of driving power was restored, could hear the turbo working as normal and all seems well again. No beep's or dashboard warnings have come up. Dropped it down to my local dealer who investigated and could find no fault or explanation after doing a diagnostic, manual check and test drive. Anyone have any ideas or experienced the same? Just be nice to know what caused it.