macbook pro crashing wifi
Since updating to mavericks, my 2011 macbook pro has had regular total crashes (where the system becomes totally non-responsive and can only be recovered by a force shut down) Each time this happens, I am using safari or firefox, when the browser stops loading new data (although the wifi logo up top still says fully connected) - clicking the wifi button will then completely crash the system (starting with the spinning beach ball of death.) Even if the wifi button is not clicked, the system will still crash of its own accord about 5 minutes later, during which period programs behave extremely erratically.
Most of the time this has happened I have been on YouTube.
I have already tried reinstalling mavericks, firefox, and the flash plugin.
Any help much appreciated, thanks!
MacBook Pro, OS X Mavericks (10.9.3)