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Quite often I get a popup that says TouchWiz or TouchWiz Home have stopped working and it was only those two for about three weeks. Now I'm getting "Memo" has stopped working and a couple others. I don't even know what TouchWiz is! But it "seems" to stop other apps.
Having little knowledge of Samsungs, I'm not certain what Touchwiz is, but it's certainly integral to Samsung phones. Try Settings, Storage, Cached Data, and clear the cache. Follow with a Power Off and Restart.
If no go, get back to us right here.
TouchWiz is Samsung's name for their launcher.