Bart, first and foremost, I would do a master system reset, which should be done by going through the Function, System Restore, and then be sure to place a checkmark in every category box on the left side of the page before performing the reset. This may solve the problem, but for some reason I don't believe it's a software issue.

Next, change the speaker wires. Even if they are brand new. Sometimes this solves more problems than you can imagine.

Also, I would give Frank a call and make him aware of the problem. Frank has an awesome service record and will help you in any way he can.

Good luck,

Gary