I am having the same issue as well, where when ever it tries to save, either when I do it manually or via autosave it gets stuck and if I click anywhere tells me it is not responding and I have to close the program.
for a week or so previously that I have been playing the game after a long while having been away it has been taking 20-40 second to save and been showing as ‘Not Responding’ in the task manager, but has pulled through after that. but as of today (though I had last attempted to save 3 days ago) the above has started happening.
I do not have Avast! on my computer, I run AVG and Malwarebytes instead, and it doesn’t change when I set the Battle Brother folders as exceptions.