One side has stopped working

Hello Blackber,

Thanks for using the Apple Support Communities!

If one side of your Beats doesn't seem to be working, you'll first want to try connecting them to another device to see if this issue continues. This will help determine if this could be caused by a setting.

If it does persist, you'll want to try resetting your Beats to see if that helps:

Reset your Beats earphones - Apple Support

Reset your Beats on-ear or over-ear headphones - Apple Support

Post back whether resetting seems to improve things.

Cheers!