Same issue is happening to me. Using Motorolla sb5101. Modem is one week old. Previous modem had same problem. Everything looks fine; I just periodically loose the connection. When I try to repair the connection, it says it can't. Power cycling the modem works 75% of the time. Sometimes I have to wait 30 minutes. Comcast has been here once and are scheduled again for later this week. Any suggestions? (In Seattle, Windows XP, no router)