The bug was definitely introduced with the last Update Amber Sky. It sees to affect PC mostly.
If I start the game in Vulcan (always gives me better performance) the game will at some point have FPS drops from 80-90 down to as little as 6FPS. This can either be triggered by opening the menu or map, by launching the drone or just randomly. Sometimes if its triggered by opening the menu, it will stay after you close the menu, sometimes not. I can play the game until this happens, but knowing it can happen any moment, doesn't make me wanna stealth a mission just for the bug to destroy all my progress.
Im DirectX mode I can't confirm the same behavior since I didn't play the game long enough to verify, because with the constant freeze frames ever 10seconds it's even more unplayable.
I know people also have reported it directly to the support. I mentioned this to u/UbiBard in other posts, but there's no answer nor statement from him nor Ubisoft.
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