I had a Monoprice HDMI 4x4 Matrix switch that worked perfectly for about 3 years, then about 3 months ago it failed. I immediately ordered another which had problems. I'm on about my fourth Monoprice 4x4 switch now and have had problems with all of them. Nothing else has changed, just the switch. I'm at the end of my rope and looking for another 4x4 switch. Any suggestions?