You're not the only one. My watch recently stopped recording my HR etc after the update to R800XXU1FUD1. None of the "fixes" I've come across do anything so it's Samsung and its software that have messed up here.
If resetting the watch has not corrected the issue, then service is recommended. For service options, please reach out to us via one of the following options: 1. Facebook Messenger: http://m.me/samsungsupport 2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513- 3. Private Message: http://bit.ly/2XERsky
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