I just picked up a Kemper power head a week a go and I’m getting strange sound like a spaceship landing after chugs and palm mutes along with chords. I’ve followed all the instructions from Kemper for restoring to nothing and backing up with no relief. Are there any other Kemper owners out there that have any answers or have had the same issue? It does this in both headphone and speaker out. I don’t have the means to test the main outs atm. I tried attaching video file but its too big.