Ok this happened 3 times, twice on t4 and once on t8. I dont think it has anything to do with which cards are in my deck (first 2 had non CotC card, last was only CotC) but when AI can't perform any action on its turn. In 3 cases AI board was empty and it didn't play anything from hand. On 4th try I deliberately left one of enemy allies to live and there was no bug that game. So if AI doesn't have an ally to attack with and it doesn't have resources to play a card (I would suggest checking what happens if it has resources but there is only artefact in its hand and it can not play it because it already controls one copy on board) game will bug. Just a theory.
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