I updated the firmware to the latest version but I still have this problem:
When I start a workout for example walking in the open, the watch starts recording all the parameters but suddenly without warning and occasionally interrupts itself without giving any command and deletes (before end) all the data stored until then making it impossible to monitor the training.
This happens all the time, sometimes after a few minutes, sometimes almost an hour etc.
The battery is fully charged, the firmware updated but continues with the same problem.
Has anyone noticed this problem and knows how to solve it?
Thanks
Did you a full factory reset after the update ? . Its advisable
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This is why I rarely leave my recliner. 
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use third party fitness apps instead for increased reliability over stock:
google fit
strava
myrunningapp
runtastic
myfitnesspal
runkeeper
fitbit
nike running