It seems your issue is most likely outside your home. have you tried connecting the modem to the NID and testing ? This will help isolate the issue. If the problems persists it may be an issue at the Central office. I would try to get a tech to your home ASAP and also contact Customer service & ask for a credit. When I had a similar issue a 24 hour monitor was implemented by upper level support.
Do you know how far you are from the CO you are; and how old the wirng from the CO to your home is? Good Luck!
Thanks, JOSEm441. I have not attempted to do anything directly with the NID. I live a couple dozen blocks from a big downtown CO, in a small city with several COs. I will try to figure out how to schedule a technician visit and to get a credit.