I woke up this morning and my ultra 21 home screen had 4 apps, would not swipe left or right, it is as if One UI disappeared. I had to download Nova lanucher to make the phone usable. I have no idea what happened, I tried clearing the cache partition and that did not work. I am stumped. Any help would be great. FYI there is not themes in settings and no ONE UI Home. Updates are not available saying "service unavailable, having trouble authenticating your device"