There are times when one of the buttons of your iPhone 4s do not respond to touch or perhaps takes repeated attempts to ultimately get working. If you are facing this problem then it is advisable to get an iPhone 4s repair done immediately. The phone is functioning today but it just might stop responding the very next day.
The most common switch which refuses to respond at times to respond is the toggle switch or the one that makes the phone mute. Since this particular key is used time and again repeatedly sometimes the switch tends to becomes dysfunctional thus creating problems.
However there is no need to panic, one can always turn to fixiphones.net. They have the help of expert technicians and they can always fix problems with switches like this quickly. Their iPhone 4s repair service always remains active to solve problems like this which are pretty small but too big to ignore.