I also encountered periodic game crashes when switching turns while playing one map. However, I managed to find a workaround and finish the game. :) But I haven't had any freezes yet.
Well, and as I said, Battle of the Titans is not for beginners! Before you start a new game on a map, be sure to pay attention to the difficulty set by the author: standard maps included in the game are more suitable for beginners; most author-made maps are designed for experienced and strong players. Also, as a rule, it is easier to play on maps of small size: M, S.
(Василь Симоненко. Люди – прекрасні)