Macbook Pro dropping connection

I recently bought a Macbook pro and have been very happy with it. However, about two nights ago, for absolutely no apparent reason, it simply dropped internet connection.

It can still see my network, but when I try to select it I get a ‘connection failed’.
A quick google suggested I should zap the PRAM, which I tried, but with no luck.
Has this happened to anyone else? Is there a fix?

As ever, thanks in advance!