2005 Grand Prix GT non-supercharged. I use the remote on my car when able, like anybody would. It usually works just fine. But there have been three times in the past year where I would get out of the car and attempt locking with the remote, and there would be no response. From there, the remote quits working altogether. I know it's not the remote, and I believe it's something with the security system. Two of those times, I was able to get it working again by starting the car, shutting off the car, and then with the key still in the ignition attempt to use the remote. This third time, however, it hasn't worked.
Also, nothing is showing in the DIC that would indicate a security issue.