I received a Nike Series 3 Cellular for Christmas last year. Since day 1, I've had trouble measuring swimming distances exactly. Usually it will measure 1 / 2-2 / 3 of the total distance I swim in a workout. It also began to measure general activity very poorly, but it was gradually improved. When I got an XR a few weeks ago, this activity measures again. I finally decided to look into the issues and contact Apple two weeks ago (the day after my warranty expired, I found out later). Over three days and a terrible customer support, they suggested that my only option was to pay the replacement cost of a new clock. Is it pretty much what I'm stuck in, or is there another alternative? Alternatively, have any suggestions to improve accuracy during a swim?