I have had my EP500 hooked up via the line input to a Yahama 659 for almost 2 yrs w/ no issues. Recently added 2 surround back speakers and a BluRay player via analog inputs & optical to my receiver (this is the only thing that has changed w/ my system). Now when I hit a button on my TV or satellite remote control, even if the receiver is in standby, I can hear a small "thump" come out of the sub.

I also have a PS3 and Satellite box w/ optical lines plugged into the receiver. Nothing else is connected. No video runs thru the receiver. Everything sounds great when I am simply listening to movies, music, TV, etc.

Any ideas what could be causing this annoying noise????