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@Gordon
The MDBT42Q module itself lists -40°C as the minimum operating temperature, so I would have thought that you'd be fine. I don't believe any other components on the Puck or MDBT42Q breakout would cause you issues (not at -5 degrees).
I'm be pretty sure the battery would be the first thing to go - looking at the datasheet the cells supposedly are ok down to -30, but the voltage out of them drops. If the cell were already partially run down, low temperatures would definitely cause issues.
If you output the battery voltage over Bluetooth as well then you might possibly see if the voltage was getting very low just before the Puck stopped?