Trying to power on my 255s. I get the triangle logo, and other bootup screens until the "Loading FIT files" screen, then it turns itself off, then goes to the triangle logo screen,then gets to the FIT file screen, turns itself off again.....over and over. Its stuck in a loop. I have tried plugging it in the Garmin Express; pressing power button for 15 sec while plugged in (all that did was trigger a call for assistance which scared my family and friends at 1030pm), removed the device from my account (now I can't add it back). I have barely used this watch and I want to sell it but I cant in this condition. Please advise.