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Why have all my apps stopped working? Internet connection is good. I see other queries of this same nature but there don't appear to be any solutions other than "it eventually fixed itself". Those queries are over a year old though.
First thing to try is to reboot and/or power cycle your TV, if you didn't do it already. Also you may try to delete the Android (I suppose you have an Android TV) cache as well. Something like:
"Settings/Memory/Internal Memory/Cache" e confirm the deletion.
You should better specify how you're sure the Internet connection is good if you can't start any app, though.