CAX80: Modem is offline - Please check RF connection

None of those suggestions will fix the problem.  It is clear where the problem is from all the uncorrectable errors on some of the frequencies.

See, over the air TV stations, radio stations, cell towers and other things are permitted to broadcast radio frequencies through the airwaves on dedicated frequencies.  Since no two devices can share the same frequencies, the FCC acts as a traffic cop to prevent collisions.

Cable companies can use the whole spectrum that is used by the broadcasts over the airways.  This is because the coax carrying all their signal is encase, mummified, inside a foil and braid shield (usually a triple or quadrupal shielding).  This is not only to prevent over the air signals from bleeding in to your cable (ingress), but also to prevent your cable from bleeding out signals into the airwaves (leakage).

If you have a coax connector that isn't perfectly crimped, the dialectic flush with the connector with the exact amount of braid folded back onto the jacket, using the specific type of snap n seal connector for the cable used (triple vs quad shield), then this will happen.  In other words, if you have Radio Shack twist on coax connectors on a do it yourself cable.

Or if your coax has a radius bend too tight.  Or if there's a nick or cut in the coax.  Or if the connectors are not sealed and water got in the line.  Or if a single filiment/hair of shielding braid was left behind and comes in contact with the center conductor, injecting airwave signals into the coax like a giant noise gathering antenna..

The point is, a lot of errors (both correctable and uncorrectable) are happening on and around certain frequencies which are no doubt seeping in from a TV, radio, cell or otherwise station nearby.