Hi, I'm not sure if this is the right place for my post, but I hope I can get some advice. I put D'Addario flatwound on my Rick 4001, and after a year or so, I noticed that the sustain became very bad. It almost sounds like muted. I don't think this is a general problem for Rick bases, but has anyone experienced similar thing? Do you know what's causing this problem? I have a feeling that it may be a pickup problem because when I compare the sustain with my other basses without the amp, all of them are about the same. My Warwick Corvette Fretless with flatwounds have older strings, and still have good sustain.