Internet Troubles

Hello,

I have recently been having problems with my MacBook Pro (Retina Display). Sometimes the computer will crash unexpectedly and restart entirely. Though this hasn't caused any problems yet, I am scared that I could eventually loose important information on my computer. It seems to happend when I click a link on a website or am just using the internet in general.

Also, I have been having some problems connecting to the internet. Sometimes my computer will not connect and I have to restart my computer so that it does connect to the internet. This same problem occurs with different wi-fi connections, so it does not have to do with the network that I am connecting to.

Both of these problems started around the same time, that is why I think they might be related. Does anyone know what could be causing this, or what I could possibly do to fix it? Thank you!