On Tuesday of this week, Apple released the first update for Apple Watch, bringing the OS up to version 1.0.1. The patch was intended to improve both Siri and the performance of third-party apps, as well as fix a number of security issues. Unfortunately, the update has also had adverse effects on the Watch’s heart rate sensor for more than a few users. Watch owners on both Apple’s support forums and MacRumors‘ message boards have posted that their heart rate reading are being taken at infrequent intervals, as opposed to every 10 minutes.

The history of heart rate data can be found in iOS’s Health app. The Watch’s default is to check a user’s heart rate every 10 minutes all throughout the day, and more frequently during exercise and workout in order to track in real-time. The users who have been affected by the new bug are noting that readings are very sporadic, sometimes maintaining a schedule of every 10 minutes, and other times there are gaps of an hour or so.
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https://www.slashgear.com/apple-watch-users-find-latest-update-is-affecting-heart-rate-monitor-22384855/