Another email after I remembered something that might be useful…
Not sure where we are going with this at the moment as I am sure you know..
I just remembered there is another odd issue. The ambient lighting randomly changes to light blue. I thought, since I normally have dark blue, it was just my eyes. However, I have proved it, and it is indeed changing from my dark blue setting to light blue. Other XF owners have reported this also.
Only mentioning it in case it leads to a solution for any wider problems.