IPAD3 upgrade iOS7 system without sound

Problem phenomenon

The title, just upgraded a few days ago has been good, played a few last night rhythm master, and then charge to sleep, this morning to find no sound, the situation is as follows:
1,siri has sound, in Siri's Operation screen side volume adjustment button can be used (adjust effective);
2, set--sound--adjust the size of the ring and choose the type of ringtone, sound normal, and the side of the volume adjustment button can be used (adjust effective);
Note: All of the above 2 conditions are normal at all times.
3, the game or other applications have no sound (including music playback also no sound, music is playing in the process of no sound, and adjust the volume of the high and low progress bar can not be adjusted), and the side of the volume adjustment button can not be used (adjust invalid, so The volume adjustment with Assistvietouch function is also invalid------------no change of volume;
4, occasionally normal use, and then in the use of the process will suddenly no sound, (for example, playing the rhythm of the master, playing well, suddenly no sound, and the side of the volume control button can not be used).
5, in the absence of sound, the insertion of headphones will have a sound, and the side of the volume control button can be used (adjust effective), pull out and no sound, inserted and sound.
6,ipad in the Rhythm master put there, no headphones, no sound, then suddenly there will be a sound, rang for a while, and then there is no sound.
Note: When there is a sound, the side of the volume adjustment button can be used, when there is no sound, the side of the volume adjustment button will not be used.
And I've been brushing it 2 times, and that's still the case!!!

Solutions

You can resolve this by:
First, click Set-General-restore-restore all settings. In the computer itools such as software to clean up the cache, and then restart again, do not open the screen, let it static for a while, the sound has.

Second, clean the charging mouth, the ipad3 that charge mouth, take a toothpick wrapped paper back and forth, or use data line interface to plug a few more mobile phone charge test.

Third, remove all game applications and Apple stores that have been put on the shelf and all recently installed applications.
Third, if the above two methods cannot be resolved, you can determine the hardware should be the problem, we suggest you hurry to the service center inspection and repair!