i have just recently started to get a similar problem.
Whenever I floor it, I get a *beep* *beep* *beep* which seems to be coming from my dash - or turbo timer/EBC/digi speedo location (next to my left knee).
It's gonna be something simple, and I am going to feel like a dick when I find out what it is, but for now I have no clue.
EDIT: It is probably an alert, coming from my EBC. If it's a boost leak I know just where to find it