Why aren't my back, home and search not working on my Lumia 820?

[WPCentral Question]

back, home and search not working in lumia 820

it started all of a sudden.

I did the following,
1. switch off / on
2. switch off and remove the battery and re-fix it
3. updated the phone software

but still its not working. once it started working and that was only for five minutes. then back to the square one.

please help.

 

[several potatos]

Re: back, home and search not working in lumia 820

This could be any number of things. Try backing up your phone and doing a reset.