I think I've read something somewhere, a long time ago, about piezo pickups deteriorate when they get older. I recently started using my realist again after years of playing without amp, or using a mic. I have one bass with a realist that's about 10 years old, and another that was fitted with one just over a month ago. Using the old one I need to turn up the amp more than twice as much as with the new pickup. Is his a common thing for old pickups?