Game runs fine for 10-15 minutes and then drops to 10fps, unplayable

I have similar issues, FC25 ran well with mid to low settings 90 to 120fps easily, now, it looks like it's in slow motion, no matter if i put high or lowest settings, same feeling of performance, this is very worrysome because i preordered the ultimate edition and everything, now I fear I won't be able to play the game at all