My other use case is emulation. It’s really good at it, and even passable at emulating the Switch. Though the sleep/wake doesn’t work with those, it’s a trade off.

This was identified as a bug with the lock screen. If you have a lock screen passcode set on the steamdeck, the emulation has trouble processing it and reboots the entire system (not every time, but most of the time). Turnign off the lockscreen fixes this, but obviously if you travel with it, you don't want to do that.

There is aYuzu comment that suggests usingf the App Image version instead of the flatpak version might fix this too. https://github.com/yuzu-emu/yuzu/issues/9114