It will do a 1-X number of rounds before it does this. I've seen it do 1 and go back to Castle Wars back and immediately shutoff.
Bought 20K P.ess, 100 binding necklaces and 100 duel rings. Bank is 110% stocked. Been looking for other causes, but no pattern.
Also, (i'll get a screenshot when it happens again) two times now has the bot teleported to duel arena, back half way to the mysterious ruins it stops and doesn't go in. Not sure what causes it.