It took me 3 weeks to solve my issues. SU8 is causing problems.
I can only suggest things that helped me.
Have you tried running the sim offline?
Turn off wifi and pull the ethernet cable.
Are you doing any overclocking of any kind?
Running other demanding games without problems means nothing when it comes to FS2020. Since SU8 the game is very finicky. It loves to crash/hang-up/ and just shut down on its own.
You should be able to get it running eventually.
I know it is really not very encouraging but still wish you good luck.
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