I had new disks and pads last month. Front nearside inside pad was dragging, overheating the disk, and has warped it. It was simply because of a small amount of muck and corrosion on the pistons barrels....which is perfactly normal if your last pads had been on a long time and run particularly low. The garage who fitted them (if it wasn't you...) should have checked that the pistons were retracting fully when they fitted them.
I am having a bit of a run in with Audi about this at the moment, trying to get them to fund another new disk because it is their fault that the first one warped.
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