CTD at every 15th day of the month

As the title says, my game crashes to desktop ALWAYS at 15th day of the months. But there is a twist. Sometimes i open the game and i can only go for 1 month withouth crash and it crashes at next months 15th day, sometimes i open and it always crashes on the month i last saved 4 times in a row, sometimes it goes for 1-2 years then crashes at another 15th day of a month. Its because of an event probably but i dont have any knowledge how to fix these kind of issues or how to track them.I have every dlc and all of them are ON. Version is 3.1.0(WVMD). Mod version is 1.9.1. I don't have any submods active neither any other mod other than AGOT(this mod is awesome enough of its own). 

www.mediafire.com/file/w8tc9d20sppxpc5/autosave.ck2/file

(Not sure if related or not but, i noticed that i cant load the save from launcher menu continue button. it just crashes at painting part of loading. i guess game things its checksum is KKAD during launcher, but dont recognize its different checksum if loaded from continue button???)