Not knowing how CCI does their bonded dsl, I can take a few guesses... the first would be that they're using multilink PPPoE (or whatever they want to call it, PPP over the dsl line) and that the ppp server on the CCI end is crashing, puking, getting enough bad packets to go walkies. Not everybody does PPP, though, some actually stuff IP directly on the line, so...
A thing to try... can you get internet with only 1 pair connected? (it should, if it's set up right) If you can, does it stay up more than a day? does pulling 1 pair and replacing it make it re-sync and be happy? This all sounds like a networking thing, not a physical hardware thing. You're getting dsl sync to the dslam, you're just not getting any IP traffic. Do you know anybody else who uses CCI dsl out of the same CO? are they having similar problems? If they are, that points more toward a problem in the CO itself... losing the connection to the radius server, losing the connection to the outside world from the CO...
Just a few guesses, CCI's more a phone company than a network company, so getting the right person to troubleshoot may take... a lot of work. if it's something in the CO, it SHOULD be sending alerts to their NOC, but they may get so many low-level alerts that they just ignore them... "oh, it alerted, but an hour later when I checked it, it was working" (because the customer rebooted the modem, which forced a sync and a new request for an IP)
Good luck!
