I work for a av systems integrator company and we have used the XRt12's quite often. Recently we installed a unit, and following several days of normal operation, the video display went all green. So fair enough, Polk replaced the unit, and again the new units display has turned green as well. We've tested it with many different scenarios both at the customers house and the shop, and eventually after some time the screen becomes green again. Has anyone found the cause or a solution to this problem?