I was playing Deep Rock Galactic today. At some point I got a chat message saying there was a network problem. I ignored it, because I was playing single player. After a few minutes, I got another message saying the connection was reestablished. But right after that, I got a Steam notification saying my shared game was being played, and it was going to close in 2 minutes. Nobody else was playing DRG. I don't own a Steam Deck, and I only share my account with my sister, who wasn't playing anything at that time. After a couple minutes the game closed. I could reopen it right after, but still, pretty annoying. Looks like Steam recognized my PC as a separate instance when I reconnected.