Shadow SH600-NFX Saz Pickup

It's been over 4 months since i had it now and honestly i've no major problems with it.
It's easy to install, no drilling or modifications to the instrument body required. (obviously you will need to reset the intonation due to the fact that the bridge would be higher).
I'm using it on a Saz 120A-CE long neck.
The sound is warm, and it has great tone and volume.
The only problem that i have with it is the white noise. Due to the fact that the pickup and pre amp are not grounded you can hear white noise while no signal is being picked. It could be due to the fact that i'm using it with an interface rather than an actual amp, or it could be due to bad grounding of my outlets and pc. If you touch the metal housing of the preamp or the battery the white noise stops (hence why i believe its a grounding problem) Never got the time to open it up and check the internals. Ill edit if i manage to fix the problem.