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Turn off autosave perhaps?
 
I have the same (similar?) problem. Except for me the game would crash to the desktop & leave empty files in the save directory. But only for certain scenarios. Others I can play, & the GC seems ok too. So I've been playing that.

Paradox is working on a fix for the save problem. I don't know if it will make the next release. They're apparently having to rework the entire save module to fix it.

So the best suggestion I can give you is to avoid the scenarios that have this problem. & maybe email Paradox support with your system specs & a list of scenarios that have the problem.

John J