Why does my wireless internet connection keep turning on and off?

I run windows, use IE 7, and have FrontierFios high speed internet. My HP laptop is 4 years old The connection just abruptly ends about every 3–10 minutes for 30–60 seconds, and it is a hassle. My son can be using the network at the same time with his Apple computer, and he claims this never happens to him, so it must be something with my computer, but I took it in for repairs, and they say it works just fine with the internet at their shop.