It happened again and again after i stopped playing Natural Selection 2 game. Now i really don’t understand what’s going on with avast!. It’s so stupid to make repair and reboot the system that would otherwise run for several days without a reboot easily. But i have no idea how to diagnose it as it doesn’t happen on every NS2 play, but it did happen twice and only while i was playing this game. It never happened when i was just in Windows watching movies or browsing internet.