Gary, I would look for sources or RF like wireless routers or any other device that works with wireless signals. If you have the transmitter or receiver close to one of these devices that would explain why you're having this problem. If you have several wireless devices the best thing to do is re arrange your set up moving things around to minimize interference or "noise" from these devices. Another thing to check is if you have the soundcast devices next to metallic objects, or inside metal enclosures or somewhere where there are blocking walls or thick objects primarily metallic, or even a fish tank as water is one of the things that attenuate the signal. Try putting the transmitter in a higher place. I hope this helps.