Charter Service / Motorola SGB6580 - Internet Dropping Periodically?

Service provider is Charter, modem is a Motorola SURFboard Gateway SBG6580 that I bought on my own. We're new to cable internet service, having had slow but reliable DSL up until now.Periodically (3-5 times a day, at least), our internet connection drops. When this happens, the power and wireless lights are on, all other lights are out. The only solution is to unplug, count to 10, and replug the modem. This works, until it happens again.Yesterday, I finally broke down and called Charter after listening to my family complain about how we had traded our "great" DSL service for this "crappy" service (even though the speed difference is supposed to be something like 60x. They checked from their end, said they saw no problem, had me power cycle the modem (d/c coax and power) and said that if it happened again, it was probably the modem