Keep losing internet signal

I have a modem through Comcast and a regular, bought-at-Best-Buy router and up till a month or so ago, they've been working well. Not perfectly, granted, 'cause eventually even the best routers need to be rebooted (at least, in my experience), but lately it's been a lot worse.
Sometimes I'll be watching something on hulu (constantly streaming is the best way to diagnose this problem) and the show will suddenly stop and the buffer will show that they've only got 1 out of 5 going. When this happens, I have to click on Airport, turn it off and wait at least 30 seconds to get it going again. Then, it's fine. Usually. Sometimes I have to hit the power switch on the power strip that the modem and router are plugged into, but not that often. And this happens on both computers, and occasionally on my iPhone as well.
I think it's clear that it's a communication issue between the router/modem and the computers. What isn't clear to me is how to fix it. I don't want to buy a new router if I absolutely don't have to.
Any advice?

What is your regular router? What speeds have you contracted from Comcast? Are they delivering? Realize that when many people are on the same channel as you that things slow down so you might want to try changing the channel as a first step. Then run some speed test from: http://www.speedtest.net/
just to see if Comcast is delivering what they promise.

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