When I try to use backup assistant on my 5s app, the screen says "sorry, your previous backup assistant was interrupted" in red. At the bottom of the screen it says "please retry transferring contacts by pressing sync now" with the red sync now button below it. When I press the sync now button, it goes to the step 1 of 3 connecting to backup assistant screen with the progress bar and then nothing happens. I've left it on the screen and nothing. The progress bar is frozen and apparently won't connect.