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Is your new or did you buy it used? From factory, the USB are switched. Normally, they might stay on until the car goes to sleep.
If you bought it used, someone may have rigged it to do that. And we can't offer advice on how it was done. Sorry.
That's very interesting if its accurate. I had not read that anywhere else. And a bit unusual for something like that to not have been brought up before now or elsewhere. Maybe you are right.