Wireless network compromised

Hi all

Since I've updated to Yosemite (since it has been released), I've been getting pop-ups form time to time stating "the wireless network has been compromised and will be disabled for a minute".

I've never had this before, but after some research this seems to be a message that has been occuring for over 5 years with some users. For me only since Yosemite.

I can't seem to find a solution though, does anyone know what is causing this and most importantly how I can fix it?

Thanks