My Nuvi 855 has/had the freezing problem. I went to the Web Updater and it told me that I had the latest 4.7 version. Since I had the problem, I went to "My Garmin" and it told me there was an update available. I did the update and don't know if it corrected the problem or not. Time will tell.

I think the Garmin website has more than its share of glitches. I have no idea what it updated (took a long time) but checking the GPS itself, it says I still have version 4.7.