I bought my XT LIVE approximately 6 months ago.  The unit currently has approximately 50 hours of use.  Approximately 2 weeks ago the gain was dropping from approximately 45% down to zero resulting in a huge drop in volume and tone.  I tried turning my gain back up but the gain would not respond.  I have the same problem with all banks including the factory pre-set banks.  I encounter the same problem everytime I use the unit.  I believe that the electronics controlling the gain knob are faulty and the unit is in dire need of repairs.  This really bums me out because of the price I paid for the unit and because of the way I have babied this unit.  Any ideas or solutions?