I’ve had the DXGI error only twice since MSFS 2020 launched.
The first time was sometime last year, and I eventually tracked down the cause - it was MSI Afterburner and RTSS. After fully uninstalling both, the problem was gone.
The second time was just this week. I had just bought a new 4K OLED monitor (AOC Agon Pro AG326UD) and was testing HDR and general display behavior on an older Nvidia driver, specifically 566.14. After some time, I suddenly got a DXGI error.
What really surprised me was that I had never had issues with this driver before, so at first I thought something might be wrong with the monitor or its driver. MSFS 2024 wasn’t even on my list of suspects.
After some analysis, it turned out the Nvidia driver itself had somehow bugged out or become corrupted. I reinstalled the driver and the issue completely disappeared. After further testing, I installed the latest hotfix driver and I haven’t had any problems since.
https://forums.flightsimulator.com/t/nvidia-geforce-hotfix-driver-591-67-discussion-thread/751850
So in my case, it wasn’t Windows updates or MSFS servers - it was a corrupted Nvidia driver install.