This might he helpful but then might not.
With the problem existing when repairing or digging go to ...
Settings > Controllers > Headtracking > Set Freelook control (NO)
Start making repair and obviously the view stays focused.
Now return to Freelook control and set to (YES)
View with Headtracking now stays remarkably focused (initially).
Stop repairing and run around with character
Return to repair and the TrackIR snap starts happening. Might be slight to begin with.
Stop repairing and move around more and the snap can become progressively worse.
Disabling Freelook control and re-enabling again seems to address it temporarily.
Snap severity seems to depend on angle of view. I can stand in same spot with repair prompt visible, hit F and view may snap 45 degrees to the left. Change my angle of view on the repair prompt by rotating player body, and it may then snap right 10 degrees, or down 10 degrees. Almost random.. but not.
Hope this info is of some use.