Strange problem with sound Iphone 5

[meloonek]

Hi guys,
Ive bought Iphone 5 16 gb last friday. Everything was working completly fine, till today. Ive noticed that after using siri or navigation system for couple seconds there is no lock sounds or keybord clicks. Why is that happening ? I tried restarting and reeboting it.No help.

 

[ParagJain]

its fairly new, may be a restore might help; You may not have too much of data that will be lost in last 2-3 days