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Fenix 5 Plus / Vivosmart 3 - very different VO2max

I am using two devices: Vivosmart 3 at home when I am sleeping and in couch-mode and Fenix 5 Plus with HRM-Tri for all my activities and when I am out and about. Vivosmart 3 is set as the preferred activity tracker.

The two devices estimate my VO2max very different. Fenix 5 Plus is very stable around 45-47, but every now and then I forget to take off the Vivosmart 3, when I leave my home. The result is that Vivosmart 3 drop the VO2max to a value around 36-38. See attached screenshot. I assume that Fenix 5 Plus with HRM-Tri is the most accurate of the two.

Is there a way to prevent Vivosmart 3 from estimating my VO2max ?