I have a Galaxy watch that used to do this and it's the sensor on the back of the watch that contacts your wrist. There's 5 'windows' and if they're not lined up properly then the recording pauses. Just rotate the panel slightly to re-align and it will work properly. If the panel does not rotate just use a hair dryer briefly to loosen the glue and try again. Don't get it too hot. Hope it works for you
