If its any consolation, I'm in the same boat pretty much. * ATT Uverse 1Gbps up/down. (FTTH) (Configured for DMZ Plus/passhthrough) * Nest WIFI. Base router is in the same room as me, and confirmed that the controller binds to that AP. (Funny, I just dropped my old ubiquity gear for this.) * WPA3 enabled, and Game Preferred is enabled. (I've tried it with both on and off.) Nest wifi speed tests float around 649/150, while targeted speed tests with other tools normally float >700/>400 with ATT modem tests usually staying at the >800/>800 range. Not experiencing any screen artifacts, or notices of poor connection/disconnects. (Regardless of hardwired/wireless PC, or hardwired/wireless chromecast.) I plan to do some testing connected to my phone, it's just not been my priority as I plop down start playing and stop caring.

I've poked stadia on twitter about it, but consider it low priority for myself right now. If it's still an issue after a few more weeks then I'll start hitting up the support channel to see what I can tweak. Curious if you get any traction on a fix.