Steam Deck - SteamOS 3.5.12 Preview: Elves in Tuxedos - Steam News
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Note: This update is for the Steam Deck Preview channel, and includes new features that are still being tested. You can opt into this in Settings > System > System Update Channel. General Added support for the HyperX Clutch Gladiate controllers Fixed a system restart when Joy-Con controllers are connected Fixed a WiFi crash occurring where certain bands would cause the driver to attempt to set an incorrect spatial stream count

The Steam Deck OLED has had a bug with wifi 6, where higher wifi frequencies would crash the wifi chip requiring a reboot before WiFi would work again.

Specifically some RoG routers and Netgear routers seemed to be the most affected, requiring Steam Deck OLED users to use 2.4Ghz only or to disable WiFi 6 features (like 160mhz or “AX”) to be able to use 5Ghz.

Thankfully this update seems to fix it, I was able to re-enable wifi 6 on my Netgear router and it’s working great.