i have an apex 600a and sometimes, the thing just freezes up and will not respond to any commands other than the off button. i then have to launch the disk again, and navigate to the scene where i left off. it does this with several different titles, but not always with the same title. for instance, sometimes well, lets say the matrix for example will play fine all the way through, and sometimes it will freeze, as well as other titles. it seems totally random, but i am thinking it could be an overheat problem. can i rig a fan in the unit some how? thanks.