Internet Stalls/times Out While Browsing The Web?

For the past few months I've been having an issue where every 15-30 minutes my laptop will "stall" while browsing the web. I'll get a "waiting for [URL], etc message at the bottom left corner of the browser when it's stalling until it eventually times out and tells me it can't load the page.This issue occurs with every browser I try (IE, Chrome, Firefox). After a couple minutes, everything comes back to normal and I can continue wasting time on the internet until the next hiccup.

My set up is:

A Gateway NV57H58U Intel Core i5-2430M
Windows 7
Comcast digital cable
A Belkin Wireless router
A PS3

At first I assumed it was the router since it's a couple years old and was cheap when I bought it back then.The only thing that makes me think differently is that when I'm using the PS3 I never experience a break in connection. I can play a game online for 3-4 hours without any crashes or stutters.Also, while the internet is stalling out there is never a disconnect from the router - it always says it's connected and the signal strength is always "Excellent."