Anybody else had any problems with the RBI? Got mine the first week of Feb. and it went down on me last night. Loud feedback came from the cabs, I actually thought it was my power amp at first. RBI is fried, lol. I have no idea what caused this to happen, have had no problems with it, and its a great sounding pre amp. Anyone else ever had to deal with Tech 21's Customer Service? Hopefully they will repair or replace the unit.