Internet connection lost of Airport Express

I have an Airport Extreme bought July 2013 connected to a modem cable my ISP, Cox. I use an iMac running El Capitan. An ethernet cable to connect the modem cable to the Airport Express Terminal. Lately I lost my internet connection. I have set using the diagnostics of the network in the preferences, network, which brings me to restart the cable modem. That works, but it can last all day, or just for a few hours, and then I lose the internet connection. I called Cox Tech support and the guy said that as long as my cable modem lights remained on the balance, then it must be a problem with Airport Extreme. It also suggests to connect the modem cable directly to the computer. I have already happened up to 14 hours at a time and have not lost the internet connection. This leads me to believe that the problem is with the Airport Extreme. I can do about it before buying another Airport Extreme? Thank you.

What is the brand and model of the modem provided by Cox Internet? Is this the same modem that you use when you first installed AirPort Extreme? ... and, if so, it has had problems before connecting or just started to happen as shown in your post.

Tags: Wireless

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