I took the R out last night for a quick blast to the supermarket, and I noticed that in 3rd and 4th gear especially, when I floored it, the turbo spooled up as normal, giving nice strong boost up to about 4000rpm, then hesitated, then boosted again, then hesitated again, then boosted again, it continued doing this all the way up to the redline. Does anyone know what the problem might be, it's as if the wastegate is opening and shutting repeatedly after about 4000 rpm so my thoughts are TCS, or actuator, but not sure. Any help would be appreciated.