My Garmin Swim 2 continues to stop during my open water swim after 40-70m intervals and has a 45 number across the top when it is recording (that's not apart of the normal data screen fields). It's stopping mid swim even when I am swimming continuously, I'm not holding it underwater either. It's only a week old and each open water swim it's not working properly. I've tried different GPS settings and turned the lap settings off. I've re-started, waited a few minutes once obtained GPS signal and still no luck. I've also sycned recently with the garmin connect app. I'm not having the same problem in the pool swims. Is anyone else having these difficulties and know how to fix?