Wifi problem - working very slowly
So I'm working off a 13-inch MacBook Pro (mid-2012) with 10.9.2, and my wifi was working fine up until a few days ago.
Since then, it's been quite slow, and I tested the speed today, and it's working on a download speed of about 2Mbps.
My subscribed broadband speed is 120Mbps, and it seems to be functioning fine on other devices (iPhone 4, PC), and when I use ethernet to my MacBook, it's working fine.
Is there a problem with my Airport or is a settings isse? I haven't changed any settings over the last couple of days, as far as I know, that could have caused this. Any help would be much appreciated!
MacBook Pro (13-inch Mid 2012), OS X Mavericks (10.9.2)