Today Garmin posted version 3.30 firmware for the StreetPilot c550 to their website. Changes made from version 3.10 to 3.30:

* Added pre-recorded voice guidance support for Greek, Croatian, and Slovenian
* Added verification prompt for entering PIN on Garmin lock feature
* Fixed button row on main menu to operate on one touch
* Fixed error of missing cities in address search
* Resolved a low battery power down lock up situation

I've installed the updated firmware and so far all seems well. Installed the update? Let us know how it went and post a comment.

Grab the update here: http://www.garmin.com/support/collection.jsp?product=010-00522-00