i remembered reading this post a while back, and wanted to send this info out...
I have a 2013 base V6 and this past weekend i went on vacation in it. we were on a ferry ride with the car locked, and coming back up to port to get off the ferry, my alarm went off twice, without the button being pressed... apparently the vibrations of the ferry and it bumping into the dock??? no one was around my car (had my eyes on it like a hawk).. almost seemed over sensitive.. however, if my car did that, I would assume yours should have with some one 'jumping' on it...
Current: 2015 GT Premium Performance Package-stock for now
Past: 13 V6, 11 MCA V6, 89 GT, 88 GT, 04 V6