From 9to5mac.com…..
watchOS 7 was released to the general public last week, bringing new watch face features, sleep tracking support, and more to Apple Watch models dating back to the Apple Watch Series 3. Some Apple Watch Series 3 users, however, are reporting a variety issues since installing watchOS 7, including random reboots, poor performance, and more.
On Apple’s support forums, there’s a thread dedicated to Apple Watch Series 3 owners expressing frustration with device performance since installing watchOS 7. One of the most common complaints seems to be that the Apple Watch Series 3 will randomly reboot multiple times per day with watchOS 7 installed: