It's interesting that issue 11 is written as a warning. It's exactly the solution I chose. My cable modem always switches to higher frequencies after enough time, which never have enough SNR to work properly. I can't really force the ISP to improve their infrastructure. But this only happens after around 36 hours. I have a script that power cycles the modem each morning when I'm asleep.

I've even gone as far at this point to actively query the status of the modem and detect when it moves to one of these channels. If this happens during the day the modem is immediately reset.