Noise when switching between Perform and Browswer Mode

My Kemper has for the last weeks made a terrible noise when I switch between Browser and Perform mode. The amp sends a scratching and loud electrical noise through all its outputs, not ulike the noise you get if you plug a your guitar-cord into the guitar when the cord is connected to an amp with the volume turned up. Has anyone experienced something similar? Does any one have a clue about why this happens and how I can avoid it?