I have a 42" Marantz plasma that is hooked to a SR7500 via components. The dvd player is hooked up to the 7500 via component and toslink. When high frequency sounds are played (during a movie) with the volume up loud (-5db on 7500)the picture gets interference lines in it, this corresponds with the audio only. This plasma is just for dvd's so we have no other feeds into it, and we are using the 7500 as a audio/video switcher. Any ideas why this does this (just as of the last week or 2...never did it before)?????? Oh ya..the speakers are SpeakerCraft Starlet 4's, center RBH mc616, SpeakerCraft CSR8 three's for surrounds and RBH TS-12AP sub, if any of that helps (all in wall, except sub)