The nav and app system. It took a little work but I patiently called in weekly and did what the maker asked until it was resolved.

It's not your Sync system but another but the problem or bug was nation wide so while I did get an initial "you're the only one with this problem" the next week thousands more called in and they got to work on it.

So I agree it's a major pain but call Ford as high as you can to alert them to the issue.

Here I had a good experience once my dealer got past the "you're the only one" step.