My Dunlop Crybaby has a fun little problem. It likes to cut out when I switch it on. It doesn't cut out, there's still some volume, but it's very quiet. Sometimes when I rock it back and forth for awhile it'll come back to full power. I'm guessing it has something to do with the pot, but I don't know. I've been using it for about 2-3 years. Help, please.