Gaming Left and Right not working properly on NDS Lite.

[Smash_Brothers]

The L button is not working neither.

I mean, it does work, but only if I press really hard and only 50% of the time, making it unbearable to play. How do I fix it?

Thanks

Edit: Sorry that I posted on the wrong section, please disregard this thread as I already posted on the NDS section.

 

[BlackWizzard17]

This is the 3ds section not Ds, also try blowing into the button, this might temporarily fix the problem but it could be cause dust got trapped within.