A year ago I could either "mirror" or "cast" from my Pixel phone to the Roku 3810X stick. I was not using any 3rd-party software; it was "native". But now I can't seem to make it work; the phone cannot find the Roku. Yes, they are on the same network, and both are within 15 feet of the WiFi hub, so signal strength is excellent. I noticed that the Roku is on 2.4GHz while the phone was on 5GHz, so I temporarily modified my modem setting to disable 5GHz on the modem and force the phone to also use 2.4GHz, but that did not fix the problem. I'm pretty tech savvy, but this one has me going in circles.
Did Roku issue a software update that messed this up?
Is the 3810X out of date and I need to buy a new stick?