@EA_Aljo
Yes we were on the same home network but I don't think it come from there. We played Borderlands 3 (also through gamesharing) sunday night and everything was fine, it only happened in nhl23.
I beleive that if it was an direct issue with gamesharing, my brother would get a message saying something along the line of ''you don't possess the game, make sure its installed on your xbox'' and if it was the network, why would it crash directly to the xbox dashboard? wouldnt it say something like ''you lost connection, make sure your xbox is connected to the internet'' or something like that and just send us back to nhl main menu?
While it happened a few times that we crashed simultanously, mostly it was separatly. We never had messages mentioning issues with conectivity or anything gamesharing related. It was just sudden crashes mainly at specific moments (dressing room 9 time out of 10). We would just immadiately click the nhl23 icon again and back in.
Again, we never had problems before thats why I beleive it has something to do with the latest patch and not something on my end...but who knows..
I'll see if I can get a few games going alone today or in the next days and I'll let you know for sure if anything (or not) happened. I will also be playing a lot more with my brother this coming friday/saturday see if it keep happening.