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@Gordon
Could it be something as simple as a flat battery? Enough to boot the Puck, but low enough that the Puck fails and restarts as soon as you try and connect.
I have had reports that some of the batteries the Pucks ship with don't seem to last very long, and updating the firmware uses quite a bit of power - so it could be that the firmware update pushed it over the edge.
It'd be worth trying (and potentially re-updating the firmware) with a fresh battery installed. It's pretty frustrating for everyone but I've tried to find out why it's happening and haven't had any success - I intentionally pay extra for good quality batteries.