03 Nissan Micra steering wheel audio controls help

I was recently given a Nissan Micra 03 as a christmas present and I love it, I especially loved being able to control the radio from the steering wheel.

All the buttons were working fine this morning and we were driving it all day. I drove the car this morning and the radio buttons worked I was able to turn the radio volume up and down. But I let my boyfriend drive it for the rest of the day until about and hour ago, when I took over driving and tried to turn the music down and the button wouldn't work. I can turn the music up but not down. the other buttons on the control work fine.

For those of you who might not know The volume button on the 03 nissan micra is one long button that you push up to turn up the volume and push down to turn down the volume.

Can anyone help to tell me what's wrong or how i might fix it.
Any help would be greatly appreciated.
Thanks:)
 
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