Yep, it's GTA's built in replay system. Please don't use it, it only causes trouble. I recall a tip for the vanilla game was that you could open and close cabriolets when spamming it. Reason for that is that GTA uses a system for car models where add-ons (extras) can be defined, the roof of a convertible can be such one. We use this system in various parts, for instance for the DeLorean's licence plate or the lighting run hook. Using the replay function could mess around with these.