MrFlexx wrote:
As the title says, the left switch stopped working just from nowhere. It's been in my studio all the time and have never seen the road nor the stage. Any suggestions how to fix this and how it could happen?
If it is under warranty, send it back.
Otherwise, you don't say what product this is. If it is an H9, have someone check the soldering to the switch. A 'Factor is less likely (but still possible) to have a soldering problem – it could be a faulty or broken switch.