For the third time now, one of the wires to the battery pack in Mr. P (P22) has come un-soldered, resulting in giggus interruptus! I hadn't opened the battery compartment in several months, and it still came loose! I bought this guitar in order to quit carrying a real acoustic, which takes up valuable space on some of the small stages we play, as well as not having to carry an extra large case in and out of the venues. When it's working, it's the bees knees, but this is getting old. Any suggestions to keep the wiring in tact PERMANENTLY?