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The JB4 resets fault codes that would be raised by its operation so that might have been what happened. Depending on what tune you're running you might have mismatched the fuel or strained one of the components. Or ECU might have figured out something was wrong and tried to protect the system, might have even been a fault with the JB4 that hasn't reoccurred.
If it's been running fine for a while I'm not sure there is anything you can do figure it out short of disassembling the car and checking every component and even then it might have been a software glitch.
Just my .02
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