After last update I have a lot o problems with my Mac List of my problems :the internet connection seems working for a moment and it suddenly stops. when I click on wireless icon, I click Network preferences, and I am unable to see configurations as the windows seems to be stuck. I am unable to restart or shut down the laptop unless I press the power button. After restarting I either have no problems laptop is working for some time and all problems start again often, I am even unable to switch on the wi-fi at all. It just doesn't seem to work and I am forced to restart again.