@e6321 I’ve been using sportwatches, smartwatches, and fitness bands from different manufacturers for decades, and only the Vertical 2 gives me this issue. Even the Vertical 1 never caused these problems.
I think the hardware has now reached a very high level of precision, just like the algorithms that interpret the signals. However, the additional customizations introduced at the software level to improve data representation may be adding noise — or removing noise — from the signal.