I have the following symptoms on my POTS line that are even baffling the Verizon technician:
I've tried resetting the ONT per the instructions from Verizon Support (unplug the battery and power, wait 5 minutes then reconnect them) and the problem goes away only to return hours later. I've also disconnected all the phones in the house and noticed that the problem still remains.
As well, the technician has replaced the ONT and the problem still recurs! I suspect that it's a problem at the CO. Any ideas?
My first thought is it's inside your house. I know you said you unplugged all your phones, but did you know there is a spot in the Ont where it says customer access? In there there is a telephone jack and a spot to hook up your inside wires. Take a hardwired phone and plug it into the telephone jack, this should disconnect all your inside wiring. Now dial your phone number and see if the trouble still exist.
Let me know how you make out.