Whenever I click system updates for the phone to check for updates, I just get the "Checking for available updates. Please wait..." screen with the blue wheel animation, and it just stays there. This is the case over wi-fi. When I do it over 4g, it tells me "System Update is not available at this time". Anyone know why? Also, if i manage to fix this problem, should I even download the update? Some people say it made their phone worse.