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I've been getting small outages each day for a while now. Since this started I switched from the xFinity modem to a Motorola. I've been digging into the logs and seeing regular alerts...
#Dynamic Range Window violation
#Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:4d:df:ca;CMTS-MAC=58:97:bd:2e:45:5d;CM-QOS=1.1;CM-VER=3.0;
#Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4d:df:ca;CMTS-MAC=58:97:bd:2e:45:5d;CM-QOS=1.1;CM-VER=3.0;
Also I've been seeing regular port scans from 75.75.75.75:53 (Comcast)
Also here are the Down/Upstream rates...
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Any ideas?
Thanks
Is the modem resetting when you lose connection? You would see the lights cycle and the events would also be noted in the logs. How many T3, T4 errors are you seeing in a day? Is there a router involved? If you eliminate the router do you still have issues? See the troubleshooting guide, it might help.
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Alright, let's get an employee to take a look, they can see some values that we can't see from the modem. My guess is that you'll need a tech to get this resolved. If so, the employee can help you get that set up.
I've asked a Comcast employee to help you. You should expect a reply in this thread. 
Tip: If you need service, sign up for the Service Protection Plan (SPP). It's around $6 a month and you must keep it for at least 60 days after your service call. If you have SPP, you won't incur a service charge. You can sign up when you schedule an appointment.
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FWIW, not sure if it is the root cause of your problem but your downstream power is a bit on the high side.
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Hello Dayvid, it sounds like we may need to get a tech out to look into your services. But first, I'd like to check into your signals on my end so we can determine if a line tech is needed or if it can be resolved by an in house tech. Please send me a private message with your full name, street address, and account number by clicking on my name (ComcastAmir) and then "private message me".
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You're welcome, and thank you for providing your account information. I show that your signals looks great coming from the plant, but the signal at your pole outside is showing poor upstream power. I can send a signal to your modem to correct the issue but a tech may be required to repair this issue. Is now a good time to send a signal to your modem?
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Dayvid wrote: Thanks for checking, it's been OK. It sometimes seems to have small bouts of slowness, but not much.
I am glad that we were able to get this taken care of for you, have a good day.
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