@Barteld-Hartstra said:
Thanks for all the answers. Although not all the same, one thing is clear: Tread is the big culprit.
You're getting it mostly right. To be precise, it's not Tread specifically causing the problem. Instead, it's the Garmin Explore DB component you activated when you installed the Tread app.
When installing Tread, you're prompted to answer a number of questions related to how you want the app configured. One question (I'm paraphrasing) is "Do you want to use External Storage?". If you answer "YES", Gamin will save in their Cloud all the individual components of your Routes. Garmin is trying to create an Apple like ecosystem where everything created on one device is available to all devices connected to your account. The problem is that Routes can be corrupted when interacting with the Cloud for calculations. It's a good architecture in theory, but Garmin has really messed up in its implementation. The graveyard of Zumo XT2/XT3 users who are frustrated and have given up on Garmin gets fuller by the day.
The solution? It's not to give up on Tread. The app has a lot of cool functions for Phone, Traffic and Music. The answer is to not enable External Storage (i.e. Explore DB) when installing the app on your phone. The downside is that you have to use wired GPX transfers into the Garmin/GPX folder on your device. Copying your routes through the app is no longer available. The reward is Garmin not messing with the components of you Route. This approach 100% works.
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