I have a Bose sound system with a box and 2 speakers used with my TV. All of a sudden they started making a high pitched noise with my TV. We have another identical sound system on another TV (working perfectly) and when we swopped them over the exact same issue happened. But they both work perfectly on the other TV. The TV in question also works fine without the Bose sounds system plugged in. We are guessing electrical interference of some sort? is there anything we should be looking out for that might be causing the high pitched interference? Sorry not particularily technical in my description.