Cable Hum in NBS Cables

I have a pair of 32' XLR NBS Statement that has a faint lower-treble buzzing noise. After an hour or so of system warm up, the noise is reduced. It is in both channels and it only does it when used between line stage (ARC LS5) and amps (now ARC CL150). If I shuffle equipment around and put it all on the floor, to try the cables in other positions, the buzz is gone when used from phono stage (ARC PH2) to LS5 OR DAC (ARC DAC3) to line stage. So my guess is that it has to do with the output stage of the LS5 not being a perfect match with such a long run. Once the music is going, the noise cannot be heard....only when the volume is all the way down and I put my ear against the tweeter (Maggie 3.3s) do I hear the noise. If I switch to other long cables, ARC Litz Line, the buzz is gone....but so is the awesome magic of the NBS. So for now, it is not a big issue. I just wanted to raise it with the group to see if anyone has any ideas. Could it be as simple as needing all the connections on the XLRs re-soldered? This could end up being expensive so any other ideas would also be welcome.

Thanks