Rapid beeping at ignition off

[SethGX]

Last week I drove home from work on a nice clear afternoon, nothing remarkable about my 25 minute drive at all. After backing into my garage, I put it in park and turned off the ignition. It turned off, but immediately starting a fairly rapid beeping coming from the center of the dash. There were no error, warning or any other messages on any of the screens. I turned it back on, started fine, still beeping. I drove back out of my garage, all normal except, still beeping. Back into the garage, park, back off, still beeping. Got out, locked it, still beeping. Unlocked, got back in, still beeping. Got my OBD2 reader out of my glove box and was getting ready to hook it up, the beeping stopped. I'm going to estimate that it beeped for about 3 or 4 minutes. I went ahead and hooked up the OBD2 reader and checked for errors, but it showed nothing was logged. I did video record most of it in case I needed to show my dealer, but I wanted to post here in case anyone else has had this happen. I've driven it many times since then and it has not happened again. Hopefully just a really weird fluke.