Hi, I have a macbook that is about 2 years old, maybe a little less, and recently it's been giving me trouble. Every time I go online (on firefox or safari), the internet stops working after about 20 minutes. It used to be about every hour but it's more frequent now. To fix it I have to restart. Once I restarted and the internet didn't even work. It's getting to be immensely frustrating since I have to save everything else I'm working on, restart, and then reopen everything. I don't know much about computers but I'm using a wireless that's shared with one other mac and one other pc in the house. Any ideas of what I should do? Thanks!