Apple Watch Ultra original ghost/phantom screen touch only with WorkOutDoors app

The Action button is set to do nothing.

I don't think it has anything to do with the app. My guess is that some sort of hardware fault is sending erroneous taps to the app which has to assume that the taps are genuine and acts accordingly.

Here are the developer's comments:

Thanks. That file shows that you manually paused the workout at about the point you mentioned by using the long touch menu. However this was part of a series of things that you did which included tapping once to show a metric; tapping twice to show a full screen map; changing the map type to Thunderforest; and then repeatedly trying to pause/resume.

So I suspect that you are accidentally touching the screen at times (maybe your sleeve). Firstly you just tapped it once; then twice; and then touched it for a second to call up the long touch menu. Once this menu was displayed you tapped Settings then Map and then Thunderforest (which are all in the top right of the screen). You then repeatedly tapped the pause/resume button, which is in the bottom left of the screen.

Another possibility is that the watch is generating "ghost" taps, which was a known issue with watchOS, and can be fixed by rebooting the watch. However your watchOS is up to date so it seems unlikely, but it is always worth rebooting.

At that point he didn't realize that I had enabled Water Lock on start and had already tried rebooting.

So, a mystery.

I think the developer has pretty much established that it's not the app software. The log shows that the watch is erroneously sending taps to the software which is handling those phantom taps appropriately. That is, as if they were real taps.

That said, I was all ready to reinstall the software yesterday afternoon when my wife got home unexpectedly early from work diverting my attention. I never got around to it.

This morning, there were no phantom taps.

So, if I had reinstalled the software I'd be saying now, "Great it worked". But that would have been wrong. I didn't reinstall and something still worked. That's the problem with errors that are not 100% reproducible.

Frankly, I think it's time to give up. It's just a minor annoyance which doesn't affect the workout stats.

Since I still have Apple Care+ so I could raise the issue with them, but I'm afraid that would be an unrewarding waste of time and effort.

Thanks for your help.

I have not reinstalled the app. Can you explain technically how that would help?