I’m wondering if Wayland support in Wine will encourage Valve to support Wayland in the Steam app too.
On my desktop I run a Wayland window manager that doesn’t implement XWayland so I can’t run Steam directly. So I’ve been running it in Gamescope in big picture mode - which is actually exactly what the Steam Deck does.
I had that symptom, and I found that my laptop was using S2 idle (suspend to idle). I fixed it by switching to S3 sleep (suspend to RAM). I suggest following the instructions in section 3 in this page: https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate
Like many Arch Wiki guides, most of the information on that page is applicable to most Linux distros, not just Arch.