Hi there everyone, I have noticed a horrible noise that comes from HD 100 head.

here is a video of what is going on:

http://www.youtube.com/watch?v=Z9h-cpszSdc&feature=youtu.be

I cannot really explain much other than it happens at random moments, and the only way to get rid of it is to turn the whole unit off.

Even if it is kept on and I unplug my guitar AND cable, it still makes the sound!

It's a huge let down as this happened after every song I played at this gig, it really ruined our show to be quite honest.

If anyone could get back to me that would be great thanks