Iphone 4s sound fluctuating after upgraded to IOS 8.1.2

Hi,
I recently have Iphone 4s from my sister and when I updated to IOS 8.1.2  the sounds is fluctuating. Most of the time, you will not hear the sound speaker while playing the music and playing games. Calling is fine only the speaker sound. When it was IOS 7.1 I have not encounter any problem.
Please help.
Thanks.
Leonides

First, try to reset the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again. You will not lose data by resetting.
If this does not help, set it up as new device, explained here:
How to erase your iOS device and then set it up as a new device or restore it from backups
If still no luck, get it checked by visiting an Authorized Apple Service Provider or contact Apple Support to get it serviced:
iPhone - Contact Support - Apple Support

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