I've had the same issue, I use map my run but have also tried the default app too. Sometimes I'll get a GPS lock after about 30 seconds, other times it can take several minutes, every few weeks it will fail to get a lock completely. Today it drained 73% battery life trying! Its done this to me once before and a did a factory reset, this solved it for a few months but here I am again with the same issue. I'm loathe to keep having to factory reset a fitness tracker I paid nearly £200 for because it can't carry out its main function. Samsungs lack of response to several customers complaining of the same issue is concerning. I'll be taking it into a Samsung store for a face to face conversation, hopefully I can get some sort of answer.
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