You can no longer download the latest update for Apple Watch, and that could be a good thing if you have a Series 2 device. Cupertino has pulled down watchOS 3.1.1 after it bricked several Series 2 watches, displaying a red exclamation mark on their screens along with a URL to the company's support page for the wearable. The website doesn't address the current issue, but it does have instructions on what to do in case your watch freezes.
The first course of action is to force restart the device by pressing and holding the side button and the Digital Crown at the same time. If you don't see the Apple logo replace the exclamation mark after 10 seconds or so, then the next step is going to an Apple Store and having the device looked at. According to AppleInsider, force restarting didn't work for a lot of affected users -- they had to leave their devices with Geniuses, who had to send them in for servicing since they don't have access to the Watch's diagnostics port. Other people opted to ask for a device exchange when it became clear that force restarting wouldn't work.
Cupertino has yet to reveal why watchOS 3.1.1 bricked some devices. But since the update was supposed to fix a bevy of bugs that affected notifications, messages and other features, Apple will most likely release a patched version that doesn't freeze Watches in the near future.