It might help to say what model it is but, as always with such kit, my first advice would be disconnect the power, leave it for a while and then reconnect the power. Are you sure that it's the monitor that's freezing and not the camera? From my personal experience with them, Auto Vox Support are very good indeed - suggest you email them and they usually respond quickly. If you've only had it a couple of months, it should still be covered by warranty.