i gotta 98 GTP and recently had to unhook the battery cables a few times.now,every now and then i can switch the car over and get nothing and the key seems to lock up in the ignition around halfway and will not go backwards.you can open the drivers door and then switch the key over and then you get power back.the only light that is on i notice is the gear shift indicator and the rpm tack bounces a little and a vague door bell chime.this has happened like 4 times in a few weeks but not all the time.i am wondering if the security system may be malfunctioning or is it major?i still have the factory delco stereo btw.help thanks.