CM1150V modem frequent and long reconnects more recently - upstream channel issue.

My post just got deleted!! 

First set of numbers is when I first installed this replacement modem a week ago and the latter two this morning, with no internet connection 

The only real difference is in mumber of correctables (whatever that is????) 

But all the same Downstream and Upstream Channels are Locked, as they were when working, or not. 

I have been having similar issues lately 

All was well until mid-Nov or so, after almost a year of working perfectly on my 600Mbps service 

Then I started having serious slow down and drop outs and EVERY morning would have to power cycle the modem, when it would work perfectly again for a while 

Xfinity checked my lines and signal back to the street and all was perfect - they connected an XB7 modem and that has been perfect for about 3 weeks.

Then my replacement CM1150V arrived about 10 days ago and I reconnected that 

Again it was working perfectly until yesterday, when started having same issues as with the previous modem 

One quirk I have found - I used to correct it by power cycling the modem; now I have found if I request repeated Speed Tests (I use the Ookla App) then after severel fails (no internet) it will eventually hit - the first one that reconnects shows a very slow download of only a few Mbps, but 18Mbps Up (which is my spec) - and the subsequent test then immediately returns 600. This lasts a while and then it drops off again. (even during the composing of this message)

Now again, this new modem has been perfect for about 10 days and the exact same problem started happening again yesterday. 

There is definitely something about Xfinity service that this modem model does not like. 

Now I don't have the Upstream issues that you have Santa_Cruzer but the symptoms are certainly very similar - there is another thread specific to the Upstream problem if you search in this forum.