Why does the sound of my iPhone goes off while it's charging

Why does the sound of my iPhone 3GS goes off while it's charging? Yesterday I updated my iOS 4.3.3 to 6.1.3, and today, I plugged it to the charger while music was playing, and the speakers.kinda.turned off. But the "play" emblem was still there. When I unplugged the charger, the music proceeded playing. What's the problem?

I had the same problem. Simply get a new charger.

Are you using a 3rd party charger? Yeah! I agree with the 1st reply you should get a new one. Make sure it's from Apple.

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