Game plays great on Steam Deck however I find I have to exit all the way back to the launcher before sleeping. If I sleep my deck mid game, when it wakes I get stuck reconnecting and it never resolves. When I have tried to close on 2 occasions in this situation it hard freezes and I have to kill the application.
I dont expect flawless sleep resuming, happy to be kicked back to char selection or something. But at the moment the client/server doesnt handle sleep and resume well. I am finding i also have to close battle net all the way too - otherwise D4 doesn’t seem to connect i get (unable to connect) errors. this didnt happen with D2R. also reported by another here:
https://www.reddit.com/r/SteamDeck/comments/140eovs/help_diablo_4_freezes_in_handheld_after_afk/