(I’ve never had this with the NVidia cards I’ve tested…) Beyond that I’m afraid I can only confirm your experience, not offer a definite fix. Also ensure WIndows and the Game are fully up to date. I’d suggest using the application ‘DDU’ (display driver uninstaller) to remove all trace of your display drivers, then reinstalling Radeon software from AMD’s website. Sadly I never found a fix, other than restarting the PC and the game, when it would normally run fine again for the duration, until it didn’t again. It should remain high/100% unless you’re sitting at the normal 60FPS frame rate limiter.
You’re obviously not CPU or RAM limited with a 5900X (12% utilised) and the tell-tale is GPU utlisation being under about 95%. The GPU has significantly higher potential than that - normally running in excess of 60FPS in the test flight I use over NYC on high end settings preset. I’ve had occasions when it simply sits at 45-47FPS and will not run higher (this was at 3440x1440p so similar to you). I’ve tested a lot of GPUs in FS2020, and I’ve noticed this beahviour with a 6800XT too.
