Med map, tinkerer, all norm.
So far (2 games) i have had 4 CTD's. Best i can recall they were all after 2+ hours of play. No error message. Only strange symptom preceding 2 of the crashes was that the FOW in tactical battle (translucent cloud/fog covered battle field) never cleared. i.e. it was present for the entire fight. Never had either happen pre beta 4