My installment of FATW CTDs just as much as all other mods i've played, which include the latest versions of EB and RTR platinum, Roma Surrectum etc, etc. I believe it has to do with my computer leaking memory or something, because it seems to happen usually when i've played a huge amount of hours in the same sitting, and especially after playing out big battles.
I'll take the chance and turn autosave back on, and if it causes corrupted saves, I'll simply have to try and learn to save manually.
So anyway, thanks a million for the help!