Gear fit 2 pro drops in and out with heart rate

Constellation

Gear fit 2 pro drops in and out with heart rate

At the end of my day when i check my contionious heart rate (i have it set to all the time) there are periods of time that it has no information. Sometimes it will be an empty space of a couple of hours. I am not taking the watch off or doing anything abnormal during my day, is there anytips to stop this from happening?