I'm having the same problem with my stock GT 70T car. I decided to see if I could improve on my time last night after not running it for a couple of weeks, and I couldn't get around the track without flipping. Highly annoying, especially since this car has been one of my most stable and predictable and my fastest stock class car and I have made no changes to it in months. What's worse is I couldn't figure out why the handling was gone. I'm starting to wonder if my driving style has changed since I have been testing on 2 or 3 brushless cars for the past two weeks. I hope I'm wrong about that, because I much prefer driving brushed motor cars, but I can't see/feel anything wrong with the car, so it must be me. Might vacuum the track to see if that helps. Puzzled and annoyed!