E-Diff Overheat

I have been experiencing E-Diff issues tracking my F430. It has a tendency to overheat and cause the warning light to come on at the end of each session. The warning light goes away once things are cooled down. Had this looked at several times by the dealer and have spent a great deal of money for them to try and fix the problem including a clutch job when clutch wear was only at 60%. This was because they wanted to tighten a bleeder screw that has a tendency to back itself out over time and the only way to get to it is removing the clutch. They also changed the E-Diff magnetic valve twice now. It never happens driving around town or even spirited cruising in the twisty backroads. Only at the end of a hard session of twenty minutes or longer. Anyone can help shedding a light on this.

Also included a clip of my last track day with Porsche club chasing a GT2. A silly mistake of not switching from Sport to Race before getting on the track and couldn't figure out why the car was not as responsive and holding back when pushed coming out of corners. Finally noticed that it was in Sport and you can see me switching it into Race. Much better after that. You may hear a beep warning at the end of the session when I was exiting the track and that was the E-Diff warning.

http://youtu.be/jAOXUqZO85A

 

Sorry about that. Haven't uploaded too many videos on youtube. Should be fixed now.