Low fps glitch. PC

I have problem with FM 7 on pc. It runs fine for couple hours with stable 60 fps. Them i take a break and fire it up again to get steady 19 fps.
I have everything set to dynamic/advised in graphical options. Changing graphical setting doesnt help much.
So sometimes games runs in 60 fps the other time i fire it up its 19 fps. No changes have been made to pc. Game looks the same to me
Found one post about it where person had exact same behaviour and disabling vsync helped him, but in my case it makes no difference.

GTX 1050 Ti 4GB RAM
i5 4590
Win 11

PLZ help