PBGas
Experienced
Absolutely not. I have replaced everything, including the neck. The cause is the body absorbing the vibrational energy of the strings at one specific frequency. As I've said, this is not a new problem. Good luthiers have been trying to deal with it for a long time, and it is well known by bass players. It is not just my experience, it is well documented
The other problem is that bridge is an absolute POS. Take one apart or repair it enough times and you'll quickly realize this. I had the exact same J custom and I also had a dead spot on that model. It had something to do with the wood they sourced for the 10 or 20 that they made of that model. I sold mine right away.