VR creeping

Had the quest3+iracing for a while, really happy with settings, stable 90hz/fps. I run a motion setup with the VR.

It's been fine for months, no issues at all until the rollover into this season.

Now I am getting viewport creep forward and up at every track, every car and resetting the hmd position 1-2 times a lap vs previously maybe once a race on the grid.

No external trackers just the quest3 on USB and openXR. I have tried with motion on/off, motion compensation on/off and just no change.

I think it might be a quest3 problem more than anything but unsure where to look!

Anyone else fighting a q3?