If you have a MAIN CATV box, with a blue stripe down the side (mine does), hit the reset button on top, unplug both the modem power and USB cables, wait a few minutes and replug the modem.
You may need to get a reset signal sent from CommieCast, but the manual ritual above seems to fix mine.
Let me know if/ how that works; I have one more workaround.
All OK, thanx