Help. more sensitivity of pole pieces, interference noise

Interference, hissy sound when I play my fender roscoe beck!
The bass is passive, when I went to the studio the producer noticed this interference. But the interference desappears after some seconds. I dont know how to explain it well, but when I put my fingers close to the strings the noise start to get louder, I take off my hand of the strings, the noise is still there, then suddenly dessapears. It is different than the hiss of the ground, sometimes the noise appears when I am playing, lasts for some seconds and then go away. I keep quiet and the noise appears and dessapears, so it has nothing to do with a bad wire that moves and make the noise.
I could record that day cause the noise dessapeared, now I think it is making that noise more often.
Now I realize the pole pieces are more sensitive than before.
Next week I will go to the luthier, but can somebody give any advice of what is the problem??
Thanks

pd: To add more info; both pickups are in humcancelling mode in series.

 

help please

 

To add more info; both pickups are in humcancelling mode in series.

 

It makes the noise in different places.:scowl: