Keypad tones reduced on its own Please Help

[Rj19]

Hello
It's the 3rd week of my IPhone 4S and suddenly I realized yesterday that the keypad tones have reduced to about 40percent. The speaker seems to be working fine when I play any songs or turn on the speaker while in a call. What should I do ? Do I really need to go to a store and get it checked

 

[chestvrg]

The same thing has happened to me, I usually do a reboot and it fixes the problem. I'm on 5.1, maybe this version has a bug with the KB tone volume.