I got the same when I was running Stadia on a 2.4 GHz wifi network. Once I switched to a wired connection, it worked like a charm. 5 GHz supposedly works as well, but my robot vacuum cleaner needs a 2.4 GHz network facepalm.
I have a PV inverter which doesn't work if there's more than one AP with the same SSID and is 2.4GHz only... ended up buying an el-cheapo AP and giving it a unique name. PITA