I recently moved and had CC for the previous year I was in my last place. I used a vpn almost all the time and my line stayed up pretty much 100%.
this year when I moved, I transferred CC to my new place and I continue to run a vpn. I now notice, for some reason, that after a few hours, I get a loss of ping to anything. if I stop my vpn, the default router is still unpingable. what 'fixes' it is to reboot the cable modem (and my access pfsense router, which then gets a new dhcp primary addr) and then things are good again for a few hours.
not sure if this is related, but if I don't use a vpn, the line stays up for days and weeks at a time. when I use a vpn, I get a few hours at a time.
might not mean a thing, but then again, it might. I can't quite tell yet. what I am planning on doing is designing/building a reboot/test loop so that my line will stay up even if I'm not home to notice that it went down.
I had to do that kind of thing with pacbell dsl about 10+ yrs ago (their alcatel, aka crash-catel modem was at fault back then; but same thing happened - I'd lose connectivity and only a reboot of the modem would bring it back again).
its not convenient but if this keeps my line alive, sigh, well, this is what I will have to do.