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Question: Why does my Boston Acoustic Duo-i quit playing sound when in sl

I have a Boston Acoustics Horizon Duo-I with ipod dock and when playing the ipod in the sleep mode(auto shut off set to 20 or 25 min.) the sound will suddenly quit as if it is hung up.It will remain like that until you shut it off and restart the radio. Does anyone have any solutions? The ipod is still on and the playlist is still marching by as if it is playing but no sound.