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Post the model of your modem or gateway, your speeds are typical for a D2 modem, where the new speeds need a D3 modem or gateway. Confirm you are checking the speeds wired to your computer and not over wi-fi.
My computer is plugged into a router which is plugged into the modem.
My modem is a Motorola SB6121 Surfboard DOCSIS 3.0
My router is a Linksys E2500
Can you connect the computer directly to the modem and perform the speetest that way?
Also look into your modem signal levels and noise which is located browsing usually to http://192.168.100.1 but also could be in http://10.0.0.1 depending on your modem configuration.
A print screen of your modem signal level will help to see if the issue might be coming from the outside wiring or the modem itself.
I agree with Jim721. Signal SNR looks perfectly fine besides those few codewords which probably will stay at zero if you reboot the modem. But if you reboot the modem and you still see some numbers at the last tab "Signal Stats (Codewords)". Then you have some noise (interference) going on in the connections going to your modem.
Take a closer look at the channel ID # 1 which is the most used by the modems. In your modem signals it shows 1.5 millions correctables and only 17,728 uncorrectables which is almost nothing to be compared with the unerrored codewords which are 186,330,034,592 ..... So....
If you still keep getting correctables and uncorrectables after the reboot then take note of which frequency is the one misbehaving and let Comcast know about it.
But if you want to try to solve this issue yourself then in your side you can also verify the cable as long as you can to make sure is not broken or has hard bends and if possible try to connect the modem directly without splitters just to discard the issue is not in one of the splitters or any of the devices connected in the same cable. But this is only done if you still see correctables and uncorrectables after the reboot.