Why aren't my Back, Windows and Search buttons not working on my Lumia 720?

[WPCentral Question]

Back , Windows and Search buttons not working on Lumia 720

I use a Lumia 720 . The back , windows and search buttons are not working... Instead they are working as buttons on the bottom of the screen. I there any working solution to it ?

 

[ven07]

Re: Back , Windows and Search buttons not working on Lumia 720

If you have warranty then go back to the store. If not try a hard reset?

 

[LTTG]

Re: Back , Windows and Search buttons not working on Lumia 720

What do you mean by "they are working as buttons on the bottom of the screen"?

 

[Gourav Kumar3]

I am also facing the same problem. Please tell me how can I fix this issue?

 

[avinash sharma6]

Worst lumia 720 phone i had ever bought in my life.Never buy any lumia phone.There are so many problems in lumia 720.
below are problems.
1)Screen is jumping
2)Start button is not working
3)Screen is hang automatically.