Every time that I 'fix' a neighbors ROKU it always comes down to the wrong settings, router, something not properly connected, or the ROKU/Television hasn't been reset in months. You, of course, realize that if a Smart Television updates, sometimes the settings need to be changed and/or the entire system needs to be rebooted. People don't. They get hostile and start piling on. One individual stated he had 5-6 Roku devices that had been working and now, nothing works. If it worked before, it's interference, settings, or the router. I had one lady who decided she didn't like the way her router looked so she disconnected it and put it in storage. It's amazing what people will do. If it's system-wide, it was a software upgrade somewhere. Don't assume it was ROKU.
Once again, I do not work for ROKU.