My 2012 Enclave is sitting in my driveway with the head lights cycling on every so often. (3 times in the last hour) When I went out to check it the lights had shut off by that time but the radio was still playing inside. This is normal for when the ignition is first turn off and the radio has a few minute delay before it shuts off. The keys were in the ignition, ignition switch in the off position and key was pulled out slightly so the door chime does not go off when door is open. It's as if the key is being cycled on and off momentarily. Any idea what could cause this issue. This is the first time I have seen this happen.