Welcome to the forum. Congrats on the machine. I have had that issue with every machine I have owned with the engine braking, it will eventually free wheel unless you bump the throttle. I just learned to do that. My Polaris had "work lights" that faced the rear but I seldom remembered to turn them on in reverse at night. My RZR I installed a set of LED lights for that purpose, but it was much more difficult to reverse the RZR at night without them.