Typically the cause forthis symptom is an AI vs AI battle in an endless loop freezing the game. Look for the crossed swords battle icon on map when freeze occurs and load a previous save and rush that location to try to prevent that battle is the only thing that helped for me. Happens quite often in the TR mod so likely in this mod as well, it is basically most likely a base game issue occuring (e.g. hero becoming immortal so battle cannot be won byeither side) as it happens there as well but in theory it could be some new mod map causing it e.g. units stuck on terrain.

Thanks for the tip, I have a rough idea about that then.