One thing I cannot control for. Every observation is on a development-signed build with Developer Mode enabled, since that is the only way I can install on the watch — I do not yet have a distribution build to compare against. I am not aware of any mechanism by which that would revoke a network path periodically, and I have excluded an attached debugger (the measurements above were taken from the server side with no devicectl session attached and the paired iPhone powered off). But I cannot rule out Developer Mode itself. If that is the explanation, saying so would save me a lot of time.