I’ve had a few glitches but your experience sounds a lot worse. Maybe a bad unit? I’d try HDMI as well just to rule out displayport being an issue

I’d recommend Suyu instead of Yuzu, it’s based on the latest early-access build before Yuzu was shut down

https://suyu.dev/

I’m on Stable, but there must have been a hot fix. I’m able to play online now without the anti-cheat triggering

Added a per-device toggle to Settings->Bluetooth that controls whether a device is allowed to wake Steam deck from sleep.