I purchased a Pocket Pod in late 2010.  I used it for several months as a practice tool and set it aside for several months and again a month or so ago.  Recently I had a need to use it again and when I plugged my Heritage into it, there was an extremely loud hum, almost like a ground hum.  When I touched the bridge or the guitar cable (firmly on both) the hum would go away.  So I reversed the polority of the Line 6 power adaptor on the wall, I changed the guitar cable several times, changed to my stratocaster, changed headphones, just about everything I could think of.  The noise is incredible loud and only goes away when I grasp the strings firmly, resting my palm on the bridge, or touching the cable ends.  I contacted a local authorized service center for Line 6 and they have a bench test fee of $65.  I can buy a used Pocket Pod at that price!  This is very very odd.  I really love the tone and settings of the Pod, but no idea how this can start suddenly.  I'd hate to think I need to connect a wire to ground the unit....  Any help here would be great.