Ah, ok. Glad everyday use is good.
Just some of my observations:
The number in parentheses is the number of times Gear Tracker has tried to restart the HR service after it has stopped. The question is whether it has been successful in restarting it and the best measure for that is to look at the heart rate graph after the workout. It's perfectly possible to have something like HR (15) or more showing on your wrist and still have a perfect readout IF Gear Tracker has successfully restarted it 15 times during the workout.
In the beta, we have the choice of changing the sensor software from Internal (Samsung) or GT Service (written by the developer). I've always had problems with Internal, but GT Service is perfect. This will come to the main store version at some point, so you will probably notice a massive improvement when that happens.
As regards sweat, I don't understand why this is causing issues and I know
@TonyHudson has the same problem as you. But for me, sweat is not a problem for the watch and I am dripping wet after a hard run in the heat (T shirt completely soaked etc) and still have perfect HR readouts. (However, I do have GT Service).
When you sweat, obviously you are hot and your wrist expands, causing a tighter fit of the watch and hence HR sensor to skin. With this expansion, the moisture from sweat will help form a seal around the band, again giving a firm grip. It's not as if your watch is sliding around (if it is, it's on way too loose). The skin in contact with the HR sensor is compressed against the watch. That part of your body won't be releasing much sweat. So I don't understand how sweat could be the problem, but clearly that's your experience.
All I can advise is hold out for GT Service coming to the main Gear Tracker App soon. It is quite amazing.