Having this issue with a 2011 Edge LTD. We have had it back to the dealer several times and have received every software update they could find to put in. At one point, the music locked up as we were pulling in at the dealer. They were able to run tests and determined that the USB port module was bad. It was replaced but the problem did not go away. As of our last dealer visit, they said Ford had no idea what the problem is and they would call us when they found something. As others have done, we tried different drives with no success. One thing that we have noticed is the navigation screen freezes for the same length of time that the music pauses, so maybe its a computer problem instead of being in the sound system. We passed that info on to Ford, but it didn't help find a solution.
The more we operate our Edge, the more we learn about what is and is not working when the radio pauses. In addition to the music pausing, and the navigation screen freezing at the same time, the backup camera screen also freezes at the same time as the music. You better be paying attention when this happens because the proximity warning tones are not working either. If you’re relying on those to keep from hitting the car you’re parking in front of, things could get embarrassing pretty quickly. Recently it appeared that the blind spot warning system also was not working when the radio paused. There was a car close, but I could not be sure it was in the range where the system should have warned me. We will be watching for an opportunity to verify if this works during a pause or not. These situations make you wonder if other safety systems like the anti-lock brakes are on hold also.