I have started having this issue the last 2 weeks. I thought it may have been the auto pause so selected walk when I went running but it has still had the same issue at around 7 minutes. It doesn't even say "workout complete", I just realise when I don't get the 1 mile notification, by which time it's pointless restarting. As others have said, I don't expect this from an expensive piece of hardware. Battery also gone from 5+days (off at night) down to 2 days. Very frustrating.
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