I have been experiencing sudden internet disconnection problem, such that internet would be cut off just like that. To my surprise it turned out to be Zone Alarm, for unknown reason blocks all outgoing internet traffic. Rebooting the computer solves the problem. From my observation it could be 3 to 6 hours before it happens again after the reboot. I am not clear what triggers ZA to suddenly block all internet outgoing traffic, so any suggestion would be helpful. I am running Windows 8 Pro and ZA Free Antivirus + Firewall