2013 Sonic Chirps While Parked
 

I have a 2013 Chevrolet Sonic that I bought used in 2015. It will chirp (similar to the noise made when locking the vehicle) either 8 or 10 times while parked. This has been going on at least a year (perhaps longer), but I have been unable to find any information about what might be causing the random chirps. I mentioned the issue to two different mechanics and they had no idea what I was talking about. Has anyone else had this issue or know what might be causing it?