I have an Ibanez SR505 bass and the Bass pot is a B100k pot with a center detent/midpoint. For some reason, the whole signal, overall volume, lowers significantly after the detent/midpoint turning clockwise. Anyone know what could be causing that? It didn't always do that. Not sure if the pot needs to be replaced OR if it's something with the pre-amp. Any help would be greatly appreciated. Thank you!