My Airport Extreme emits a loud buzzing noise, but only when actually transmitting over wireless. For example, when using wired computers, there is no noticeable sound. When using a wireless computer with say Netflix streaming, there is a BUZZ BUZZ BUZZ BUZZ BUZZ BUZZ. When downloading a large file such as security and OS updates, I get BUUUUUUUUZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ... during the entire download. The buzz is loud and noticeable even across the room. Guests immediately say, "what's that noise?" 1) Anyone else have this problem? 2) Any ideas to fix it or get around it? It is a dual band model, a little over 1 year old. I only recently starting using the wireless part of it, so I don't know if this would have been a problem from day 1 or not.