Garmin Express is automatically updating the firmware on my 705 and my 500. This is no good as the current version 705 3.3 doesn't work as reliably as 3.1 does for me. I want to continue to use 3.1 and not 3.3 on the 705. For the 500 I'm sticking with 3.2 and don't want 3.3.
A workaround is to delete the gupdate.gcd file in the Garmin directory of the device before disconnecting it from the computer.