[Al Skierkiewicz]

Could be all of the above or none. I would vote for RFI (radio frequency interference) first. Just look around and you will probably see a cell tower in the distance. (or right next door) Cold solder joints have a way of becoming downright cantakerous as the temp changes, in either direction. It is a matter of expansion and contraction with temp, remember. The fact that the device was telling you no data, you could suspect anything with the radio link including an intermittant cable between the interface and the modem at either end. Look for a severly bent cable close to the connector on any cable. This is a good candidate for wire fatigue, i.e. intermittant connections. Let us know what you find.
Al