daily restart of modem

What do the modem's signal stats look like ? Try getting them here http://192.168.100.1 or here http://10.0.0.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

What is the exact make and model number of the modem ?

Is this a WiFi connection ?

Noticing a lot of time sync issues!

The signal stats were o/k at that snapshot in time. Are there any RF error / event log entries being shown ? If so, please post them too.

It is a LAN via ethernet.  It is connected to the back of a Netgear Orbi router.

Thanks Eg. I'll await a message

Even though the signal stats looked o/k at that snapshot in time, the error log entries confirm that something is going on. Perhaps there is noise ingress into the line(s) somewhere.

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.

I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They can check the CMTS (Cable Modem Termination System) for any real time degradation and / or error reports, see your node / cable plant and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll for those upstream receive signal stats.

You should get a reply here in your topic. Good luck !

Hi @Shankarhokie, 

We appreciate you for posting to the Xfinity Forums! Sorry for the connectivity issues you're having. I agree with @EG. Let's chat in a private message so I can gather your account information and begin to check for issues at the node. Please send me a private message with your full name, the name of the account holder, and the house number of your address, so I can assist you. To send a private message, click on "ComcastChe" and then click send a message.   

I've had the same issue and have a similar post. However, it still has not been resolved even after 2 modems and a new line put in. I am not sure what the issue is, but I haven't called back because I haven't had the time to spend with them. It takes literal hours to accomplish anything and still have nothing resolved.

Communicating with ComcastChe.

Any idea why my modem would have a 1970 time stamp? Seems like a lot of folks with intermittent connection issues have the same T3 error with 01/01/1970 timestamp.

Directly connected to modem. Here are the power and SNR

Upstream

Current System Time: Tue Apr 21 08:58:00 2020

Today, I'm seeing a lot of T6 issues related to hannel 37. @EG had mentioned somewhere that this "Other" channel is related to Gigabit speed tier. I am not on that plan.  So far today, the speed has been stable.

I have also been going back to check any recent software updates/upgrades. Recently, Malwarebytes did a big update and I wondered if that was conflicting with the modem/router firewalls and also possibly Norton Security.  It also added a Malwarebytes ad blocker for the chrome browser. I have disabled Malwarebytes for now. Let me see if things stablize.

Update:

Hello @ComcastChe  @EG  : After several hours of steady internet speeds, the problem returned with the same error (going to 01/01/1970).  This morning I reset the SB8200 and so far so good. I am awaiting the deep dive results from @ComcastChe