Locked at half channels and a max download speed of 30mb since yesterday around 5PM EST, hard rebooted modem several times and disconnected completely for 30 mins:
10 downstream channels have out of spec SNR (too low), and your upstream channels have a large amount of tilt (too much level variation). Please see Connection Troubleshooting Tips.
If you can't find the problem or you'd rather have Comcast do the troubleshooting, call them at the phone number on your bill or 1-800-Comcast, or chat with them using the Internet Support option at https://support.xfinity.com/chat. Chances are they won't be able to fix this remotely. If they can't, insist they send a tech out to identify the cause and correct it. Problems with Internet signals are often due to a poor connection between your equipment and Comcast's network, usually in or near your home.
If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit unless you have their Service Protection Plan (https://www.xfinity.com/support/articles/service-protection-plan, closed to customers that don't already have it). If the trouble is due to a faulty Comcast rental device, or anything outside your home, you shouldn't be charged.
I just saw your response as this thread is in 2 different forum locations, that is not the case as I have had 5 Comcast techs out here since January 2019, there is no noise or ingress on my internal and external wiring, using the analyzer device that all field techs have equipped, they plugged into the port at the telephone pole, he had to bring out a ladder that extended 15+ feet to reach the lines running through the neighorhood, and saw all the errors and flux coming from the Comcast line. The original ticket was called into the xfc or hfc help desk by the Comcast field technician and opened in January. When I called in for a credit for the month, they kept inisting they have to dispatch a technician regardless, so in order to get the credit for half the month of service - I agreed. Since then I have had 2-3 more technicians out here, they test all the internal and external wiring, and recreate the tips of the cables. When they realize the issue is not internal, they get their ladder and go up the wooden telephone/cable pole, they plug into a small grey box connected to the Comcast lines that 4 coax outputs, they run test on the analyze device and come back with tons of errors/red lines, the tech then calls the same xfc or hfc help desk to create a ticket but it told he cant because a ticket is ALREADY opened for this account number, the techs then have to hang up as theres nothing they can do and leave, they tell me all I can do is wait because issue has to be fixed by maintenance and thats an entire different department.
Please continue posting in your thread in Your Home Network.
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