My internet connection cuts out?

[Mike]

When on the internet at seemingly random points my internet will cut out for 30 seconds up to 2-3 minutes. It happens maybe once or twice an hour, and usually when I am playing "League of legends" while someone else is watching netflix, or while a ton of people are using the internet. My father says it might be the "radio controller" or something like that (he says it is old) but I would seriously like to find out. It pisses me off when I'm doing something and it stops working. We use shaw, if that means anything, and it is wireless internet.