Tonight, while watching a DVD in DD pro logic II I lost sound in my front stereo speakers... the other speakers were ok......then later while watching a TV show a loud buzzing sound appeared out of the blue in all my speakers. Just got my 990 a couple days ago. I was able to restore the sound in the mains by hitting the dolby button on the remote and the stopped the buzzing by hitting the mute button a couple times.

Anyone have any similar events or thoughts on what might be the problem?