I have seen a similar issue a few times, but not regularly, and I have not seen it since the last update.

I could see the game running, if I hit the menu/steam button, it would show up under the steam menus.

I could even hear the game sounds and music.

a reboot normally fixed things.

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I have also had sleep issue where the deck would wake up, then go back to sleep after impressed the power button. I set the auto sleep timeout to be never, and have not seen this happen any longer.

it’s like the deck woke up, checked the clock, and decided it was idling for the proper timeout to auto sleep.