@Leeford, sometimes my screen does that too, or the dash, and I’ll lock and unlock 3 times usually to get everything to sync up and go off correctly. Like 1 in 100 times. My edge would do it to occasionally.
It's attached to the radio. So even if the engine is off, if you turn on the radio, the usbs will activate. Once the radio powers down, the USB ports also deactivate.