From experience, it looks like external signal leakage interference OR high AC noise coming from a bad safety ground connection at the grounding block . Note that every DS Channel except #3 has significantly more uncorrectible errors than correcteds during the relatively short amount of time since the last power cycle / modem reset.
If you are in an area recently hit by hurricanes or high winds bringing down tree limbs nearby, please call Spectrum and set up a home service tech visit. Print out your signal levels again after your modem has been continuously powered up for at least 24 hours, and don't unplug the modem within 6 to 12 hours of your scheduled service appointment so the tech can see the modem log. Power cycling erases the log files which your tech will need to chase down and repair your cable noise problem.