Intermittent Loss of Internet? (Two routers)?

I've been having trouble with both of the routers in my house for months now. The problem will come and go, but for the last few weeks it's been more common than any time before. I have two routers, our provider being Verizon FiOS. Both of them have an issue where between every 1 to ten minutes, usually averaging at about five, our connection will 'drop'.

It happens on every OS and every device. I'm running a 2011 iMac with bootcamped Windows 7, and Mountain Lion, as well as a 2007 and 2009 MacBook Pro. An Asus Netbook, two iPads, two iPhones, an XBox, and our TV service. All of them are affected by the problem, so I'm certain it isn't a hardware issue.

Every computer says we have full connection with the internet, either via Wireless or an ethernet cable, we've tried both on both routers. When we're watching TV and try to access the guide, we have a similar issue as the computers where it won't connect to the internet, and won't give us the schedules for TV shows, the channels, all that sort of thing.

I thought it might be an issue with the provider or the ONT, but we've had four or five technicians come in, one of the routers has been replaced three times, and no matter what gets done to the hardware nothing seems to fix it. We've tried everything bar replacing the ONT all together, but that's never really come up. I'm at my wit's end as far as fixing it myself or through Verizon is concerned, so I was hoping someone here might be able to give a bit of insight as to what's causing the problem.

Added (1). Sorry, I wasn't particularly clear. They each have their own connection, and their own respective IP addresses.

You must NEVER have more than one router on a connection. It always causes conflicts and timeoutes. It can totally stop your connection. Your ISP can totally disown any help for you if you lose connection. If you need more range you use a wireless range extender or relay. I you need more wired ports you need a network switch connected to the router and all machines connect to the switch

Your routers are the issue sometimes they get to hot then burn up your best bet get a better router cisco brand or d link the best out

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