Tedmeister

Same thing happened to me. Problem was it was while on track.
Finished that session with no problems and checked brake fluid level.
Half way between min and max. Next session on second lap my
traction control shut down and my *** end was kicking out on down shifts
if the car wasn't going in a straight line. Pulled off track and was done for the day. Saw my mechanic and he suggested filling the reservoir to the top.
In the mean time he pulled the plug and wire connected to the reservoir and
everything went back to normal. Once I got some more of my Motul 660, I filled the reservoir to the max level put the plug back in and the issue has not
re-appeared.