Hello I hope someone can help. I have 2 Hitachi cp-s420’s fed by a computer with a Geforce 7800 through s-video and the screen gets really bouncy it is not all the time but it does it often. To describe it best it is like someone is turning the horizontal hold knob. The projectors are about 100’ away from the computer and I am going through a Comprehensive CVG 5x4 switchbox I have bypassed the switcher and the problem gets worse. I also put a signal amp in and it helped a little. Anyone else have a problem like this? Thanks.