Do you mean you just lose sound or does the whole unit lose power and go dark?
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I'm wondering if you are trying to use some surround mode, like Dolby Pro Logic, when you play 2-channel music. Dolby Pro Logic has unpredictable results on 2-channel audio that has not been specifically encoded for Dolby Surround. It is very common to have instruments fade in and out during the song when using one of these DSP surround modes.