Also, I've noticed that if you release your clutch too quickly in a downshift, and happen to lock up your rear tires, TCS will kick in. On a track, I've had TCS kick in a fast sweeper, then stay on for literally 5 seconds (and during all that time, I'm frantically trying to switch it off)

 

I get the exact same problem. A certain uphill sweeper I take every day, if I get on any gas in 4th, I get the TCS. Stock tires! Of course and it's been doing it for ahwile. Of course, now my fronts are new and the rears shot, so it's probably worse, but still....