I'm having the same issue with a ONE PRI and a Norstar switch.

Verizon carries the copper, and we have had numerous vendor meetings. I replaced my T1 card as a measure of good faith, which made no difference.
Customer still loses service once or twice a day, ONE swears it off. Verizon says it's ONE, and I'm losing my mind here.


If you can read this, you're in range.