I had a strange experience yesterday driving from San Antonio to FW on US 281. The entire trip, the Hamilton Supercharger (all units) was marked as offline and unavailable in the car. I was starting to sweat bullets as I got further from Johnson City with range dropping fast, and I didn't want to swing back to I-35 (Waco) to charge. Turns out it meant nothing: the chargers worked fine when I arrived in Hamilton. I suspect a communications issue between the Supercharger and Tesla--cell service seems spotty in the general area.