CM1000 multiple unlocked channels, millions of uncorrectable errors after 2 hours

[ABusOfNuns]

Hello all, I have a CM1000 with Comcast's gigabit tier service. This is the second new CM1000 I've tried and I am still experiencing these issues, so I don't think the modem is at fault here.

Ever since I ordered internet at this address, I have been experiencing speeds nowhere near 1000 mbps. Usually it hangs around 200-300 mbps, sometimes it drops down to 40 mbps. This was verified with multiple speedtests. The internet also disconnects multiple times a day.

I factory reset my modem two hours ago, and used the internet for a while before I opened the management page for the modem again. I seem to have lots of uncorrectable errors, and several channels that are not locked. Is this an issue that I can fix myself, or should I give Comcast a call and see if they can send a tech?

Any help is very appreciated; thank you in advance.

[vkdelta · Accepted solution]

you have an issue with your line. It may be your home wiring or even signal coming in from street. 

Do you have any other outlet to connect and check? 

[vkdelta · Accepted solution]

you have an issue with your line. It may be your home wiring or even signal coming in from street. 

Do you have any other outlet to connect and check? 

[ABusOfNuns]

There are other outlets in the house that used to be connected to the main line via splitter, but when we ordered the service, a tech came, removed the splitter, and made a direct connection from the outside line to the outlet the modem was connected to.

I called Comcast and a tech is coming tomorrow, will update on what happens.

[ABusOfNuns]

Tech came and opened the wall plate the coax was coming out of. The wiring in there was almost non-existent, and completely frayed. He fixed it, and now there are practically 0 uncorrectable codewords after an hour!

[vkdelta]

wow! thank you. Mission accomplished.

There is tiny uncorrectables but not too bad.