CM1150v extremely unstable critical(3) - Started Unicast Maintenance Ranging and SYNC timing errors

---

saigkrish wrote:

Team,

 I have  a xfinity 600Mbps plan. The Cable modem I have is CM1150v. ... Over the last 2 weeks, our internet is very unstable. When it works, it gives 600Mbps but then the connection abruptly stops and I have to reboot the cable modem.

 

---

 saigkrish I had exactly same issues in about the same timeframe - my internet speed is/was, as yours, excellent when it works then dropped off during course of day until non-existent or only few Mbps; power cycle of Modem brought it right back - EVERY morning I would have to reboot the CM1150V as I had no signal at all  - this just started suddenly, interestingly about the same period as yours (I'm in Bay Area CA, where is your service?). 

Similarly Xfinity tech came out after about 2 weeks of this and checked all my wiring for losses all way back to the street interface (all perfect) 

He installed an Xfinity Modem and it was back to full speed (for 2+ weeks now has been perfect) 

I had to argue the point with multiple Netgear Agents till I finally got acceptance for an RMA - my (valid, I would add) argument when they initially insisted on being able to access the modem on-line, is that they seemed to fail to grasp that to re-install, it requires having Xfinity to re-provision the modem (and then of course again, to go back to the Xfinity Modem) - I maintained that it was really simple: major problems with the Netgear, none with the Xfinity; fundamentally that concludes the problem is with the CM1150V. 

I am currently waiting for the replacement - the RMA system would not accept a credit card (any!) through about a week of trying and I had to settle for the 'ship first, wait for receipt by Netgear, then Replacement ships" plan

When my replacment arrives of course I will have Xfinity re-provision it and report back on results (I don't expect that for about another week)