Thanks -- I've followed the instructions and tried to reproduce three issues:
checking Notification Center after a reboot (result: AW Ultra freezes);
trying to use Apple Pay (result: AW Ultra freezes);
trying to open anything from the App List (result: none of the apps from the App List open anymore).
The Action button (needed to trigger sysdiagnose) causes the watch to freeze. I've waited 20 mins now, but the logs don't appear. Is there another way we can file and escalate this feedback?