Bought CM400 March 2015. Stoped working August 8th 2015. Have comcast as internet provider. They sent tech out to assess situation. Re-hooked up the CM400 directly to laptop and to wireless router. Summary of visit: CM400 modem just keeps rebooting every few minutes. Unable to keep internet connection. Swaped out CM400 with comcast modem and connection is fine. The coaxial cable port is a bit loose - could that be the problem? If so how do i go about getting the modem replaced as an $80 item should last more than 6 months.
