Hi,
I have owned a vivosmart 3 for several years now, and often noticed that it seemed to have hours on stretch of inconsistent stress measurements (high levels while I felt relaxed). While in this state, it seemed to struggle to measure even while sitting completely still ("measuring..."). However, it also had hours and days where it seemed to be behaving the right way, and continuously had measurements even when moving my wrist or the band itself.
A few days ago I decided to upgrade to a vivosmart 4 because of its extra functions. When it arrived yesterday, I decided to put it right next to my vivosmart 3 so I could compare the initial measurements. To my initial relief, the VS4 showed consistent measurements with low stress levels, while the VS3 was again showing much higher levels (~10 vs ~60) and struggling a lot with finding measurements. I really thought that I finally could close the issue, since the VS3 seemed to be the problem.
However, after wearing VS4 during the night with fine results, today it suddenly is the other way round! The VS3 is measuring without struggle and low values, while the VS4 is reporting high values and struggling a lot. I'm talking about big differences here, e.g. one is reporting stress level 14 and the other level 80. See picture.
Does anyone recognise this behaviour? Anything I can try to get it working normally?
I already changed wrist positions, tightness, putting it off my wrist for some time, etc. but no difference. Also, putting the two bands next to each other is not the problem, neither does it matter which one is left or right. Firmware on both is up to date.
One thing I did notice: when moving suddenly, it seems that the one that is not consistent, also shows a much higher heart rate (+20 or more) than the other one for some time until wearing off. Overall it seems that both vivosmarts can be in a state where they somehow are not able to track heart rate changes correctly, and get messed up. I'm mainly surprised that this apparently holds for both VS3 and VS4, regardless of the state of my own body. Also I have no clue why or when it goes from the ok state to the non-ok state, and how to let it go back.
I really hope there is a solution, since when measurements are so unreliable, it basically makes no sense to use a device like this at all. Especially since my main reason for using it is to have more insight in my body's stress reactions.
All help welcome, thanks a lot!
