Hi! I have a lr baggs M1 in my Gibson J45. I had it installed at a guitar workshop and it seemed fine playing through an acoustic guitar amp in the shop. Later when i played at a venue with a PA system i noticed a kind of ground-noise-sounding hum, that disappeared when i touched the cable. I tried different cables and bought a new neutrik one and it was the same. Brought it back and got it "fixed", (they tightened the input jack in some way) but the next gig it was the same noise and the sound guy said it sounded like ground noise and i had to mic the guitar... I should add that i recently had the mic in a Guild D25 out on tour and never had a problem with noise... Does anybody have a solution?