Porsche 917/30 Random Slowing at Daytona Oval

I’m running the new 917/30 at the Daytona oval. I’ve got a stable set up on it, no sliding sideways scrubbing speed or anything like that. Braking assist set to ABS off, collision assist off. It just randomly slows dramatically going around the corner. Drops from 250 to 190. Not near the wall, not hitting the apron. Middle of the track just loses all its speed.