Just me popping in to tell you about some ways mods can crash the game at that precise time. If you didn't mod this doesn't apply to you.
First, if you have the mod Stormworld_Rivermod installed, remove it because it causes the game to crash at that time without updating TerrainTypes.xml in installation directory. Get the new version uploaded.
Second, if you used any custom factions previously (from Stormworld_ExpandedFactions) but then deleted the mod, make sure you empty out My Documents\My Games\FallenEnchantress\Units of all custom sovereigns.