Earlier today my enclave continued to run for about 30 seconds after I turned it off and removed the key. After it stopped, I restarted it and shut it off same thing happened. I had only driven about 15 minutes in 30 degree weather. I went to start car about 4 hours later and it was completely dead. I jumped it and it started right away. I drove it home and it did not run on. It sat in my garage for about 2 hours and I thought I would make sure it would start, it did. I again removed the key from the ignition and it continued to run for at least 1 minute. Tried starting it several times and removed key and it continued to run every time. Even though the car did not start previously and seemed like battery was dead the clock never stopped running. Just wondering if anyone has any ideas ?? This is a 2008 Enclave.