Sounds very similar to my situation. An SB6190 modem that worked for a year, flawlessly, now does not connect to the internet (nor does a brand new SB6190). Nothing changed, other than taking off two TV boxes and changing my service to internet only. I even walked through the service tech that nothing physical changed (I even connected the modem directly to the service line to the house...same results).
Something has changed on the Comcast side.
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Too long of a story, but I finally decided to cut the cable and go streaming only. After returning home after dropping off the TV boxes, I could not connect to the internet with my SB6190 that had been working perfectly. I spent an hour with tech support (check connections, restart, reset...) and then had a service tech come out. He could get internet with an Xfinity modem. So, I bought a new SB6190 from Best Buy. Exact same response, no connection to the internet. I called Arris and they said it was a Comcast issue (very coincidental that it stopped after they changed my plan). Spent another hour this morning with tech support, then had a service tech out again. I ended up getting an Xfinity modem for the near term, to just get back in service. I can't help but think something happened on the Comcast side from changing my plan from TV/Internet to Internet only. I even took the modem to the box on the house to take all internal wiring potential out of the equation. Same results. Has anyone else had a similar issue? I don't want to rent a modem from Comcast from now on.
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