HEAVY FPS DROP AFTER CUTSCENES ON PC - literally unplayable

I have played FC on PC since 2017 and it's honestly the first time that a game is optimized so poorly. I have 120 fps smooth gameplay normally through the whole game (except some small fps drops during loadings but that's bearable) and I am able to play it well for a certain amount of time, in every game mode. 

Then, suddenly, it happens after cutscenes (so maybe after the first cutscene of the game before first whistle or after halftime pause cutscenes, or even after final whistle cutscenes) that the fps heavily drop to 5-10, making the game obviously unplayable for me. I am forced to shut down the game and restart again, because the problem then persists also in the menus and after a game ended. It was happening every 3 or 4 game before, but now after the last update it happens basically 1 out of 2 times. I literally cannot play anymore due to this problem. 

The fps drop is surely a graphical problem, because the game doesn't slow down - the connection and the game keeps running normally, just I see it all at 5-10 fps, so it's not just stuttering, it's really like a very fast photo album.

I have searched a lot to find a solution, but it's so difficult even because there are so many different problems with PC optimization with this game that it's difficult even to recognize which one is the right solution for you- I have tried several adjustments with both in-game graphic options (FPS cap, vsync and so on) and NVIDIA control panel options, but it doesn't seem to change anything. I literally cannot play the game anymore, and it seems like a fraud after how much I paid to play it honestly.

Every possible solution is well accepted.

my PC specs: