Quote Originally Posted by jlucovsky View Post
All of my phones are connected to house wiring. The adapter is in a closet downstairs with the cable modem. I've had this same setup for 9 years (phones, wiring, setup) and never had an issue before
Can you try connecting a phone directly to it just to test it?

According to the notes they think something is interfering to cause the digits to repeat so it could be another device connected to the wiring.