I also had 3 x'es within the O's just after a reconfiguration + restart.

Restarted again with fingers crossed, only one x remaining, and I set the clock to low.
Re-restarted still with fingers crossed, all x'es went away, all O's.
Set the clock back to high, waited for 30 mins, still all O's. Phew!

I wonder if these issues are heat related. Anyone experienced it, added cooling and didn't happen again?