bike shutting down at speed
 

At my last couple of trackdays i've noticed a weird thing: my bike shuts off while i'm still riding it.

It always happens at the end of a long straight, when i'm downshifting to set up for the corner. bike will die, and it won't bump start. I literally have to turn the bike off, back on, thumb the starter, and try not to catch an R6 w/ my buttcheeks.

any ideas? 02 f4i, 40K miles, plenty abused, PCIII, yosh full system, trackbike w/ no lights or extra stuff. thanks!