Any way to power down the BLUESTAR when car turns off.

[DavidRSullivan]

My BlueSTAR II locks up in a state where it does not recognize anything. No button presses. No phone connection. Nothing but some lights on the OnStar rear-view mirror display.

if I unplug it and plug it back in, all is good until a week later when it locks up again. Is there a way to have BlueSTAR II's power actually shut down when the car is off? Can I rewire something to accessory power?