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I know this sounds silly but have you tried to charge the batteries (or use new ones)... my JBL's bettery display doesn't work right (it shows that there is still bettery when in fact the battery need charging) so it "suddenly" turns off and like in your case when i try to turn it on it starts then it turns off again.
I was confused at first but i tried charging the batteries and everything is fine now.... I don't know whats causing the battery display problem (it used to work, i did flash the firmware but not sure if this is the cause)
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