2018 VW GTI , 6spd manual. "stage 2" Cruising on highway, rail pressure drops to roughly 725psi and stays static at that value. no more throttle, have to pull over and perform a key cycle for it to go back to normal. Normally pops up a p088 rail pressure to high code doesnt always cause CEL, but if you check stored codes it will be there. This started after Autotech HPFP install first tank of e65 was fine, next tank around e75 it started. suspected a weak LPFP so upgraded to EQT brushless rs3 pump. After LPFP install it continued to happen only when cruising on highway. doesnt affect pull at WOT. Suspecting possibly a bad rail pressure sensor as well.