Can't connect to internet on any device

I have had my TC for almost 2 years without incident. Recently we have been having connectivity issues on all our devices (Macbook, iPhone, iPad). The green light on TC is on, and airport utility shows we are connected to wi-fi (on all devices), but we still have trouble connecting to the internet. One minute it will be working fine, then the next it won't connect. When I turn the airport off and connect my macbook directly to TC via ethernet cable, I can connect to internet which leads me to believe it is a TC issue. We have tried a hard reset. We have tried restarting the modem. We even turned both the modem and TC off overnight without any success. Any help would be appreciated. Neither my husband, nor myself are computer gurus, and I'd prefer not to have to pay apple $20 for help! THANKS!!!

Please tell me the actual model number of the TC.. look on the bottom label or molded in the rubber.. A1xxx..
What modem do you have?
What mode does the TC run .. router, ie DHCP + NAT or bridge?
Do you have any applecare on a computer to still cover the TC? It might actually just need replacement.
You stated you did a hard reset. What about a factory reset?
Factory is more useful as you completely eliminate the old settings.
I then want you to set it up with some specific changes.
Wireless names different to before.. I want you to use names that are short, no spaces pure alphanumeric.
And to use different name for 5ghz.
A different name also for the TC.
I would also like you to set a specific speed on the WAN port of the modem.. and perhaps even replace the WAN patch cord to the modem.. unlikely to be faulty but it is good to make sure of everything.

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