I am currently dealing with the same problem. I took apart and cleaned up the output jack(was corroded), problem still exists. I am planing on wiring up a new 1/4" output jack this week(leaving out the XLR). Also planning on spraying out the pots with some cleaner. I'll see how that goes. I have read on other boards that the pickup could be the problem. That will be the next to be changed out for a Artec PP-437, which I think is the proper one. Cheap enough at under $20, and possibly a repair and upgrade. I'll post back when I have more info.