YouTube TV app constant buffering and freezing.

I have uninstalled/reinstalled (after a restart) the YouTube App & for 2 days it worked great but now it’s back to constant buffering & playback at 240SD instead of 720 or 1080. It’s actually worse now because before I only had this problem using the YouTubeTV portion but now even YouTube videos will freeze & buffer which wasn’t a problem before.  It’s ridiculous at this point.  It’s not the WiFi. I have 1G speed WiFi & nothing else on my WiFi ‘glitches’ just the Roku which means even if it was the WiFi, the fact that I only have a problem with the YouTube playback on my Roku Tv still makes this a Roku specific problem. YouTube App works fine on my iPad & MacBook. Anyway, people have suggested I use the Roku Stick? as they say the Roku TVs often have issues after a few years. When they plug in the stick & use that instead of the TV it works fine. I don’t know how true that is but I’m running out of options. I’ve noticed that I have to manually update the apps as it doesn’t seem like the Roku is doing this automatically. 

Also, when I power off my TV I don’t think it actually turns off, I think it goes into a sleep mode which can also be a problem as other apps will have problems until I do a restart.  How can I turn off the tv so that it’s like a restart when I power it on? 

Thanks again for your suggestions