Spark Cardio suddenly not measuring swim
I've been using my 6-month old TomTom Spark Cardio + Music for nearly everyday for almost six months in an indoor pool; I've had few issues with its performance. It is suddenly not measuring anything I do in the pool- not distance, speed, stroke, nothing. I have set the pool length in the watch, and I can't tell that anything about the watch has changed. Why is it suddenly not registering my swim?