the radio used to go off when I opened the door to exit but now it plays for 10-15 minutes. Also, the auto door lock stopped working. Any ideas

My 2012 CTS Performance Coupe (32K miles) has started to do the exact same thing (...except that my auto doorlock is fine). Is there a faulty actuator connection in the driver's side door mechanism connected to the radio on/off power..? Odd that the radio stays 'on' for several minutes after the door has been closed, but then does in fact eventually turn itself off, i.e. a delayed reaction. (related issue to the radio glitch: when I open the driver's door the overhead console light sometimes comes on as it should, and other times it does not...so I assume the same internal switch controls both that light and the radio automatic / courtesy function?). RG