These issues started popping up after the last update of the game, hopefully they will fix these issues with new updates. I’ll try it on a different monitor tomorrow, I don’t know what the result will be, but if the problem persists, I’ll wait for new updates of the game. For now I will close and play gsync Thanks for your help 
it is not the game … it is Free-Sync. Only thing what changed is the amount of FPS. It might be you run more often into the lower range.
I have same flickering in other games, therefore I not use Free-Sync. I know this lower fps because of 4K and because I play games for which 40fps are the “normal” thing ( e.g. ArmA3 ).
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I’m playing freesync off now
Does your monitor support FreeSync? FreeSync can be used on most monitors, but it doesn’t mean it’s compatible.
Which monitor do you own?
msi mag241cr monitor. As I mentioned at the beginning, I did not have this problem before. After the last update, this problem started to occur. Slight stuttering occurs when I play freesync off I opened freesync again and did 30 fps from the game settings.
I too notice the same screen flickering since the last MSFS update while using FreeSync.
I have an older 38" LG Ultrawide Display paired with a Strix RTX 3090.
For the time being I have disabled G-Sync/FreeSync in both Nvidia Control Panel & within the monitor settings.
At first I thought there was something wrong with the monitor. are there any other friends who have this problem?