I have a 2nd generation iPod Touch and on an intermittent basis it will display "Attached Accessory is not supported" when connected to various accessories. It never happens when connected to my Bose SoundDock Series II speakers, but intermittently shows up on my Sony FM/AM clock radios (ICF-C1iPMK2 and ICF-CS10iP). when the message is there, no sound is playable through the accessory. Any ideas why this might happen?