I have the Netgear CM 1150 v. I just changed over to this modem a couple weeks ago and got rid of my xfinity lease box. When i was first started up, my speed were normal, around 298, after about a week they were down to 25 so I rest it the modem and speeds went back to the normal 298. Now a week later, I am back down to 25. Am I missing something, is there something xfinity is supposed to send to the new modem? Very odd that is drops after a week.
I want to help look into the intermittent connectivity you are experiencing.
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