Just set up my new 80-500 system and its working nicely. Except- when the sub is working hard I get artifacts on the TV screen (wavey, worm-looking squiggly lines). Ideas as to the problem and/or solution?

The Sub sits right next to the TV.

TV- 5 year old 42" HD Rear Projection Mitsubishi

Thanks for the help.

M80v2, VP150v2, QS4v2, Onkyo 805, ADA1500-3, Sonos