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Active Pictups Troubleshooting

I'm in need of a little help, friends. I've had this Ernie Ball Music Man Stingray Special just over a week. Was loving every minute of it. Played it for quite a few hours in the last week with the batteries that it came with and everything was perfectly fine. Then two nights ago I noticed that it was suddenly making lots of what sounded like 60 cycle hum, or bad ground. Fresh batteries worked temporarily. Played for about an hour, nice and quiet again, I thought it was fixed. Left in it's case over night and today when I went to play it, zero output. (No, this isn't my first active bass, no, I don't leave the cable plugged in and every time I'm done it sits upright in its case in my humidity controlled closet, and I haven't banged it at all. It has been played only in my office at home)

When I put a second set of fresh batteries in today it was noisy no matter what I did. Sounded farty when playing, like dying batteries, but again they were freshly unwrapped (both this set and the last) and they are not not old, expiring in 2034.

I just ordered some fresh batteries from Amazon and a battery tester as I cannot find my multimeter. I should probably order one of those, too.

Anyways, it feels like the batteries are in there nice and snug. Nothing rattles if I hold the bass to my ear and shake it lightly. Sticking a flashlight in the jack tells me at least THOSE contacts aren't touching. And when I opened the battery cavity just now I lift the contacts with my fingers ever so slightly to make the batteries even more snug. Still nothing.

When my battery tester gets here I'm know if they don't have juice that there's likely a short somewhere as batteries shouldn't be draining from just a bad ground. If the batteries still seem to have plenty of juice, though, then I'll assume there's a loose contact somewhere. Maybe in the battery box?

Have you guys had this problem at all? Where did you find your short/loose connection?

Thanks in advance.

(Picture for attention as I don't seem to be able to upload even a short video of the noise)
 

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