My HX Stomp has an intermittent problem where I’ll be playing and the volume will drop by about 40%. It normally comes back to 100% without any action on my part. To isolate the problem I tried using my guitar plugged into the line in with a brand new Mogami instrument cord and used the headphones to monitor. Same problem as when I was going through the audio interface to record. Drops the volume and then the volume comes back. This will be a big problem when recording. Has anyone else experienced this issue? If so, what was the solution? I’m currently using the latest firmware.