So this is really annoying now. For months the watch has been fine but a couple of weeks ago now I got half way through a run and the watch stopped recording. I use the watches work out app, select running (basic work out) and press start. It records for about 10 minutes and then stops. So a couple of days ago I set the screen to stary on during the run and it was fine for one run. I ran again today and again it stoped after about 2km; no record of the run at all. Any help would be greatly appreciated.
I have the same issue as many here have posted. My "training" stops after a few seconds. Only the "automatic" detection seams to work, but not the intended ones.
After readings a lot of comments I searched through my settings and found out, that the space on the device was at 3.8 of 4 GB. So I decided to delete some apps and music (now it's 3.2 of 4 GB).
A first test showed, that a workout seems to be working now. I stopped after some minutes.
So maybe delete some of your stuff from the watch and try again. Maybe it needs more temporary space?
OK it's working since I changed the settings so it's screen always on during exercise (even without waiting for location/heart rate). But that really runs the battery down very quickly, so if I leave for a walk and it's not fully charged it's struggling to record the whole thing. It was working so well for the first two years I owned the watch, I hope Samsung can fix this soon! I will try the reset someone else suggested.
I was already pretty successfuly using the "screen always on" during a workout as a resolution, but went ahead and followed the reset steps provided by support. Hope it helps! I'll test next time the weather isn't trying to kill me.
I can confirm that @TheWalker's fix does work and it tracked my entire 30 minute HIIT session this afternoon whereas before the fix my Circuit Training tracker was the worst out of all of them for stopping/crashing. I will do a further test post-dinner when I go for a walk and report my findings.