Hi Guys I was tuning my bass last night and I noticed that no matter what I did with the D string it always sound a little flat. The tuner reported that it was infact D but as the note died out there was a bit of a warble as it degraded, almost as if it was going out of tune. The other strings seem to decay perfectly but D seemed to sound odd. Does anyone know what this might be? Strings are fairly new, they came with the bass which is three months old. It's a SBMM Ray34.