My parents are customers, and we recently switched ISP's. Although I am not a customer, and certainly not paying for the bills, I am the technician of the family.
The setup is the provided dsl modem, and then that is connected to a router. I am directly connected to the router, with an ethernet cable. Connection is fine until, thrity to sixty minutes. The connection is then disconnected/interrupted/lost. I then have to repair the connection and it works fine.
Problem is how do I fix this, as it is a nuisance and troublesome when working online for extended periods of time.
The ETHERNET label on the modem blinks and is never a stable glowing green.
If the Ethernet light blinks on your gateway, then you might have a problem with the connection coming into you house. Or it could be that adjustments need to be made to your gateway.
When I first established service, my connection via Ethernet cable dropped frequently. And when I recently upgraded to a wireless computer, I couldn't establish a connection at all. In each instance, I called customer service, and they were able to make the proper adjustments to my gateway on the spot, and my connection became much more stable even as I was talking with them on the phone.
Try calling customer service at 1-800-ATT-2020, and they may well be able to help with your problem.