Wayn (or any other NP dev) I am finding that after about 4 hours of the TIR being on with the above driver, I am finding that the tracking seems to drift in GTR. The effect is as if you are slowly looking to your right and down to a lesser degree.
If you use 'Centre TIR' the view tracks back to the same position as it was before the centring and then drifts back at it's older speed.
The sensor, Vector or my relative position have have been altered. I have also had the TIR freeze and the same with GTR's view. This I am mentioning here and over at SimBin.
A restart does solve the problem, but if you are in a long race the drifting is very off putting.