Centurylink, like most legacy bell LEC providers are simply bureaucratic more than they are technical or support driven, and certainly this happens at them. It's why when these happen, they are almost comically absurd as no one even knows what to do usually, or silo'd to the point they can do nothing to cut red tape.

A few months ago, my Centrylink DSL router started rebooting every night at right around 3am, like at 3:06, 3:26, etc, but not before or after 3 and 3:30am, far too regular for it to be a real outage. Being a network engineer by trade (and having worked for several cable isp's), this told me provisioning was doing something, but why out of nowhere?

Calling CL twice and talking to clueless monkeys got me nowhere or hung-up on getting transferred around, until finally randomly I got a competent support human that listened to my logic, agreed it was probably a provisioning thing, and dug until he found out it truly was a provisioning thing, that my modem somehow was missing some attributes that was causing it to be reprovisioned nightly (at 3am when those jobs kick off, go figure).

Most would probably assume it's a "bad connection" or something, and at 3am when asleep probably not even notice in perpetuity, but this is the sort of thing you have to expect when dealing with a telco/lec provider. Being my job and hobby, I run a network monitoring at my house that would alert me to such things with timestamps as proof, but how many else would notice to correlate events themselves?