My first trans did the same thing and it was stock. Few days later its was smoked and i had no gears left. Ive herd A LOT about the 4-5 shift from many others.
There is an issue with it. Ive seen a few threads this. nothing helpful yet...
FFTEC Single Turbo, HPF FMIC, HPF OCC, HPF Exhaust, KW V1, M3 Front & Rear Roll Bars, M3 Control Arms, Rear Toe Arms, M3 Sub Bushings, WT LSD, VMR 710s, Stop Tech Brakes, AEM Boost Pods, CF Boot Lid, Vented CF Hood, M-Tech Front, Aluminum Pedals, LED Shifter, Mat Black front Grill.