It may be that the version of YouTube you’re running isn’t wholly compatible with your TCL TV’s OS. Try updating or reinstalling the app.
With this solution you might have to sign in to your YouTube account.
If the YouTube app comes preinstalled on your TCL TV, most likely, you won't be able to uninstall it. However, if you've turned off updates for apps on your TV, it could be that you are using an older version of the YouTube app.
Here's how to check if your TCL TV is running the latest version of the YouTube app.
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Go to the Apps tab on your TCL TV. (You can also get here through your TV's settings.)
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Look for and open the Google Play Store app.
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Navigate to your profile.
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Go to Settings > Auto-update apps.
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Toggle this to always update your apps.
As you can see above, there may be many things getting in your way of seamless YouTube streaming. However, with a few simple fixes, you should be able to get back to watching the online video site on your TCL TV.