I have a CM1200 and 1gb service but only get about 560mbps downstream

There is a known issue with the CM1200 and Xfinity. I also have this modem and with LAG enabled I pull 1200down / 45 up however after a period of about 6 hours the connection starts drops speeds to 25/25 until a modem reset occurs. Netgear can't fix it because xfinity has to push the firmware update. can we please get a reply on this? its been a issue for over a year and there are hundreds of others maybe thousands by this point. 

Was this resolved and what is solution?

I’m having exactly same issue 

been over 3 weeks w customer service and 4 tech visits.   

@julia_rodgers 

Please create a new topic of your own here on this board detailing your issue. And please refrain from reviving old dead threads. Thanks.  10 month old dead now being closed.