Top speaker stop functioning all of the sudden without reason.

I just got the Z3 for about 10 days. Everything was fine until today. My phone was ringing and right after I answer the phone, the top speaker went off and stop producing any sound. I switched to the bottom speaker and it was OK. I tried to call the person back and the same thing happened. After the call of tried playing music and no sound could be heard. I restarted the phone once, and still no sound from you Walkman (I have checked the volume and made sure it wasn't on silent mode with the volume cranked up at maximum.
I restarted again and still no sound. I was about to call sony support and then I tried to uncheck and then re-check everything in Sound, under the Settings.
Miraculously, after checking every options in Sound, including sound on keys etc, I tried playing the Walkman and the sound was back again. I also tried calling someone to test the top speaker and I am able to hear from the top speaker again.
Could anyone please help me to clarify on this issue? Has anyone encountered such issue before?
Thanks for reading, and also your feedback would be greatly appreciated.

If that doesn't work you could either repair your phone with PCC 
PC Companion (PCC)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
or Contact your local Xperia Care 
http://www.sonymobile.com/global-en/support/contact-us/
"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

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