Normally, after turning off ingnition with my 2011 HHR, the ignition warning bell will sound when I open the driver's door until I remove the ignition key. All of a sudden, the warning bell will not turn off when I remove the key - it will only stop when I shut the driver's door. Thus, when I open the driver's door to re-enter, the warning bell will immediately start ringing until I either shut the door upon entering; or when I fully insert the ignition key. What's going wrong here?