Have a 2023 Tahoe High Country with rear seat entertainment. Since the RSE is so inexplicably limited in its capabilities, I purchased a Roku stick that plugs into the HDMI and USB ports. I noticed when I turn off the engine, exit the vehicle and lock the doors, that the Roku's white activity light continues to blink, suggesting there's still power to the unit. I am concerned that if I leave the Roku plugged in, I will drain the battery. Does anyone know if the power to the USB shuts off after a few minutes? I couldn't wait long inside a non-running vehicle in the Florida summer. Thanks.