wheelz999,
When I got my URC's MX900 and MRF350 (the RF base), it had an RF sniffer mode. I had to run around all over the living room to find a decent spot that didn't have has much RF interference. In the end, it ended up on top of my closet covered with a Frisbee! That's what it took to quite down the RF. It's very possible that you're getting so much interference that it cranked up your volume. I'm not sure if interference can do that or not, but it's something to check out.

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Denon 4520, EPIC80/500/VP180 Speakers