Sometimes for about 20 seconds when I use my mouse to move (left+right mouse buttons) it freezes the game until I let go. Graphics, sound, everything. If I try to go again it freezes again. When this happens then I just have to move forward using the arrow key instead of the mouse. It stops doing that after a bit. This has been going on off and on for several years and over several different computers and mice. Not a serious issue, but it's annoying when it happens and I wish I could figure out what is causing it. Has anyone else seen this and does anyone know what I can do to keep it from happening?