Underpowered USB port may have caused the GSM Modem dropout

I suspected that the Option Icon 322 GSM modem dropout (timeout on 'at' commands) may have been due to USB power supply capabilities. So, as a test I have been running the GSM modem with the Beaglebone Linux board, but attached to a powered USB hub instead of directly attached to the host USB port on the Beagleone. My simple program that reports temperatures and power status has been running without a hitch for more than a day now, so it is looking likely that this is the problem. I'll let it run overnight as a further check before enabling the full range of monitor capabilities, which include replying to SMS senders instead of simply tweeting the SMS and running commands sent in the SMS text.