Fuzz tone w/ Fender Deluxe Active Jazz p'ups

Hello, Very Knowledgeable People!

I have a beautiful Warmoth short scale Jazz-style bass (I bought it used). It has Fender NS3 Active Jazz p'ups, and the wiring setup is the same as on the Fender American Deluxe Active Jazz. My other basses are passive, so I don't have much experience with active circuitry.

So. . . I had a gig last night, and when my bass was in Active mode, it sounded like I was playing thru a Fuzzrite. [Davie Allan lives!] Interesting, but not the sound I was going for. I had another bass player plug into my rig, sounded fine. I changed cables, still fuzzy. Since time was of the essence, I just proceeded in Passive mode. Today, I put fresh batteries in it and tried it. No fuzz.

So. . . Is fuzz a common symptom of dying batteries? Or do I perhaps have an intermittent poor connection? Gremlins? Aliens from outer space? Other suggestions?

 

Thanks! Glad to know that's all it was!