Do you have a means of reading the freeze frame data? That should give you some insight into what is going on.
As I read the documentation, the fault you are seeing requires two consecutive drive cycles to set the DTC and turn on the MIL, and three consecutive drive cycles without the fault will automatically reset the DTC and turn off the MIL.
Do you run WOT every time you drive the car? If the problem only occurs then, you may have been cycling between a pending code and no code, but finally the odds, and your heavy foot, caught up with you. It would be interesting to see what 3-4 drive cycles without WOT does. It would also be interesting to see what resetting does.
The manual is usually pretty good about describing all of the actions taken when a fault occurs, but nothing is perfect. It also can't take into consideration what gets changed with a tune. If this is a tune-specific condition you need to be talking to the tuner to find out what they do to affect it. Re-writing data tables can have unintended consequences, and this just may be one of them.
Sky NA 2007 Midnight Blue
Sky RL 2008 Carbon Flash - Naked