I was practicing for my lesson tomorrow, and my bass quit making much sound through the amp. Then I would fiddle with it and it would start working again. I thought it was the amp at first, but my guitar plays just fine through the amp. So I tried a different cable but that didn't help. The problem got worse, until it now randomly makes a sound out of my amp like a police siren. I'm thinking it might be one of the pickups. Any ideas? It is a schecter stiletto custom 4 and a fender rumble 150. Any help would be gtrestly appreciated Bc. I need to get this fixed quickly so I can do my lessons.