Remote app doesn’t work anymore

I am having the same problem as so many others have posted here. My iOS Roku app (version 9.5.2.6753341.1) was connecting just fine to my TCL model 43S435 Roku TV software version 12.0.0 build 4190-CG IP address 192.168.1.95 with no problems whatsoever for at least a year until last week it just doesn’t. I believe that corresponds to when the latest app version was downloaded onto my phone, so it is CLEARLY a problem with the app!! Tried all the suggestions—reinstalls/power down/up/unplug you name it. Nothing works. I even asked my Roku app to find the TV by its IP address, which the TV is displaying on its screen, and the app looks and can’t find it and says “no ROKU device at that address. This is just stupid. And every response I’ve read here from the Roku people is just pass-the-buck BS. (And yes, all of my devices are connected to the same WiFi network—I mean seriously—who has multiple Wi-Fi networks running in their home? You’ve got a problem ROKU—we can’t all be making this up.