iOS updates in the past years haven’t exactly been smooth sailing. In contrast to the earlier days of Apple’s mobile platform, updates have been riddled by bugs right from day one, some of them more serious than others. It seems that even Apple Watches are no longer immune to this predicament as owners of the Apple Watch Series 3 have been complaining of random reboots ever since they upgraded to watchOS 7.
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https://www.slashgear.com/apple-watch-3-watchos-7-update-causing-random-reboots-27640089/