-Check your monitor osd for sleep timers, you may have accidentally set a timer.
Then:
-Start with windows trouble shooter for sleep timers.
-Run sfc and dism (goggle for more info) to check for corrupted files.
-If you have an older Nvidia card, 10xx or below, check for firmware update. Although that is for DP issues, it may help(search Nvidia firmware)
-If you’ve been into your bios, you may have switched on some energy saving by mistake. Don’t go there if you haven’t been there and/or unless your familiar with bios setting.
As I launch MSFS the fans seem to really ramp up and I lose full display on my monitor. I have to do a full reset. Everything is fine till I launch a game.
Sounds like your cpu or gpu is overheating maybe. If you have temperature monitoring software, set it to record and run msfs, then check the temps. The problem may also show up in windows reliability: open start, search and type reliability.
Have you been able to run msfs for an extended time ever. without any problems?
Did it run well before you updated drivers?
If it ran ok before, go back to the older drivers and re try msfs.
Try a different monitor if you can.
Search the web for “monitor shuts down randomly” , that may lead you to a similar issue and a solution.
Also try searching for your exact monitor or visit the manu forum/help area, it could be known problem.
MSFS is very taxing on systems and will expose any weakness’s but I don’t think your cpu is overheating going by your problem description, but it could be your video card overheating, but I don’t think its that either, sorry to worry you unnecessarily.