Does anyone else have issues with their nitro lite vest coming unzipped? Mine randomly separates from the bottom. ITs not like the zipper is moving down to unzip it, the whole thing just separates from itself. Its only happened a couple times but I never notice it until I get back to shore and the only thing holding It together is the small Velcro strap. I zip it back up, try to separate it by hand and cant, so I go back out sure that its secure and come back with it separated again. I have no idea whats causing it. Im thinking about adding another strap for safety sake. Otherwise this vest is awesome! I get tons of compliments on it. I love the artwork.