Tried the usual correction steps: Renew IPConfig via command prompt, disconnect — then reconnect — modem, disconnect — then reconnect — telephone line, replace telephone line, disconnect other phones, disconnect wireless router, etc.
Nothing worked. Picked up the phone to call tech service, noticed high level of static on phone. While calling, Internet service returned. Hung up phone, service went out. Picked up the phone, dialed the tech service number, DSL service returned.
Checked the phone line coming into the house. Static on-line. Called tech service. They promised to check. Thirty minutes later, static gone from phone line but DSL still not working. Called DSL support. They suggested changing the modem and installing new line filters.
Headed for town to use wi-fi service for Internet work, dropped modem off at Citizens office, fixed a problem with a client’s WordPress installation, went to visit mother at her assisted living facility, ran into drenching downpour on way home — discovering that I had failed to pack rain suit in motorcycle saddlebags, returned to Floyd to pick up modem — leaving trail of water on their floor — headed home and plugged in new modem.
It worked — for about 15 minutes. DSL service came and went. Disconnected wireless router. No change. Shut down cordless phones. Still no go.
Remembered I had put in second phone line three years ago for short-lived home-based business. Went outside house to telephone network interface, switched incoming main line to second line, then tried DSL modem on phone jack for second line. It worked. Installed splitter and plugged in phone. Everything worked.
Bottom line: The problem was ours, not Citizens. The 34-year-old telephone wiring that was installed in the house when it was built in 1977 is probably worn out but the newer phone line installed in 2007 works fine so we will live with that line with one incoming connection until I can look into rewiring the rest of the house.
Back in business. Ah, technology.