| Could be really messed up electronics and you're getting shocked. I've had that before when I played outdoors (stood on the ground) or played in a place with poorly grounded power (or under-powered). Have someone else play your bass and see if they get shocked.
Or... it could be pinched nerves. If it happens a lot, see a doctor, they might have some help. I used to get that in just one finger, and not all the time. It finally just went away.
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Never confuse beauty with things that put your mind at ease. -Charles E. Ives
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