Please note that we've updated the Mount & Blade II: Bannerlord save file system which requires you to take certain steps in order for your save files to be compatible with e1.7.1 and any later updates. You can find the instructions here.
I should add that it worked again after i created this thread. Right before i crashed first time, i read in the server chat that others had also crashed multiple times in row, so i figured i make this. Its prolly nothing, what do i know.