If you have a ROKU tv, get used to clearing the cache. Hit the home button. then:
Hit Home button five times, up button once. reverse twice. fast forward twice.
This will cause it to seize up and hard reboot. You want this. Better than even unpluging the set and replugging in; also, it's quicker. Then select YouTubeTV or whatever.
Your streaming will not buffer or if it does, it will not be because you needed to clear your cache. Do this WAY before you are about to watch something important. At least 10-15 minutes before, if not more.
Thank me later.