12 hours ago again problems with this error for a longer period of time (at least an hour). It seems to be a server being down when this happens. Not very nice when this happens when paying 20 gems to play.
In this particular case: battle froze at my opponent's first move, so only thing I could do was concede. 'Unknown error' message pops up when I try to reenter. Then circa 20 minutes later battles were up again, but the system had forgotten one of my wins.
So instead of being at 4-1 I was 3-2.
And I ended with 8-3, while it should have been a duel I could have completed.
Former co-lead of Resurrection of AMAB and Untamable; Retired: Parked in the Fifth Element; Make War, not Races