"Accessory not supported by iPhone?"

so yesterday had trouble iphone 4. volume went away. flipped mute , , still didnt work until plugged headphones in , problem went away.

right after realized wanted plug in iphone on philips dock speakers use everyday , message pops saying "accessory not supported iphone", except, been using everyday last 2 years.

ive reeboted , nothign seems work. has happened them?

 

yeah i'll every , accessories. if turn screen off top on/off button , plug in, works. weird...

 

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