I should make a canned script like the Cox representatives have stating that I didn't change anything, I don't have any splitters or amps, and that I've done all of the standard troubleshooting. 🙂
The good news is that the issue seems to have resolved itself about 2 hours ago. Went from DRW violation almost exactly every 5 minutes for almost 72 hours to no errors for the last 2 hours.
Fixed by Cox? On a Sunday? Probably not, so I'm thinking whichever neighbor was injecting noise into the line disconnected their faulty device. Let's hope they don't connect it again.