Fallout 4?! As odd as it might sound this is partly how I came to the Surface Book 3 (and not a newer Surface Pro) - upgrade to something that would run Fallout 4! Still playing it now :) I don't get many issues running fallout, unless of course it has decided to drop the card unexpectedly.
The issue does mean it stays as an overpriced laptop most of the time and rarely becomes a tablet - the party trick it was bought for. Losing the primary graphics almost EVERY time it goes through a detach re-attach cycle is maddening.
It does seem more stable on Windows 11, although wouldn't say it was completely fixed.