I am also experiencing random freezes throughout the game. Last night it actually froze while I was in the map screen. The mouse froze and I could not exit the map screen using F11. The tanks on the map also stopped moving. The strange thing was, the map shortcut keys still worked (Esc still paused the game, space key selected fire/hold fire, etc). I had to CTRL-ALT-DEL to close down the game.