So I just upgraded my iPhone 7 to iOS 11 Developer Beta 5 (15A5341f) from beta 4, and I have my Apple Watch running WatchOS 4 Beta 4 (15R5331g). I want to update it to the most recent beta that came out yesterday, but when I go to the Watch app and check for updates, I get the following message.
Could Not Connect to Apple Watch
Make sure your Apple Watch is nearby, powered on, and not in Airplane Mode.
Then, after clicking dismiss, the Watch restarts for some reason.
Is anyone else having this issue? I have already filed a bug report and submitted my iPhone's diagnostics, but I can't imagine that will help since you can't attach Watch diagnostics.