ThePFam wrote: ... the us/ds light seems to blink for a minute and then shut off for a minute. Then after about a cycle every 5 minutes every light on the modem lights up for about a second and this cycle continuously repeats ...
The device has lost its connection to Comcast's network.
Check to see if Comcast is reporting an outage for your area by using the voice response system at 1-800-Comcast, the "My Account" app, or by logging in to https://customer.xfinity.com/Secure/MyServices/.
If no outage is reported and you want to troubleshoot this yourself, please see Connection Troubleshooting Tips.
If you can't find the problem or you'd just rather have Comcast do the troubleshooting call them at the phone number on your bill or 1-800-Comcast, or chat with them using one of the "Trouble" options at https://www.comcastsupport.com/chatentry/, and have them send a tech out to identify the cause and correct it.
If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit unless you have their Service Protection Plan (http://www.xfinity.com/spp/, about $6/mo). If the trouble is due to a faulty Comcast modem, eMTA, gateway device, or anything outside your home, you shouldn't be charged.
mine is doing the same thing.... came home from work and cable and internet were out, cable came back after a few hours. four days later still no internet. did you get yours fixed?