You are getting ingress at 735 MHz, which implies broken / frayed coax (in your home or out in the weather somewhere; it could be a pole / trunk line issue). Check for open / unused cable drops in your home (they should be terminated with resistors) and loose connections.
This (735 MHz) is part of the spectrum that was auctioned off to the telco's for more cell phone service. Are you located near any cell towers?
Thanks for posting your signal level log, it makes the up-front diagnosis much easier. I can see two separate potential problems with your modem connection:
1) On the upstream side you have one channel trying to run excessive power because it is not being heard at the head end. That symptom is almost always a cable system problem.
2) On the downstream side you have one channel  missing completely and a second  that is plagued with uncorrectable errors. These suggest ingress interference, aka leakage, of external signals into the cable system (and maybe a system hardware failure on 18). It could be your cell phone sitting within 10 feet of the modem, OR a loose or broken coax connector indoors and there's a cell site within a half mile of your home, OR it could be a loose or broken connector outdoors on the mainline trunk cable that is near a cell site.
First make sure all your indoor connectors are "bright and tight" with no loose fitting nuts (they are 7/16") or water corrosion. If that doesn't fix it, the fault is probably outdoors and not yours to fix.
For that you need to CALL SPECTRUM and schedule a home service tech visit. Don't let the m talk you into "It's working again" because they will cancel your service call. Thehome techs can usually determine whether the 'leak' is inside or outside and fix the indoor stuff themselves. For outdoor leaks the home tech needs his ladder to check your pole drop. After that they may need to arrange for multiple crews with bucket trucks, which can take a few days to coordinate.
Thank you for the responses!
I had a tech cme out.. He tested the lines and replaced the line wrapping around the house from the underground drop. Recent status reports have shown a large sum of uncorrectable errors.. The weather in the area has gone from 50's F to a fast drop of lower 30's F.