Every time I try it, I get a different error, such as "keep still" or " make sure watch is tight and try again" or "don't let your hands touch"... come on samsung make your mind up!!! ... so frustrating. I'm doing everything right. It used to work. I just tried doing an ECG too (where u also have to rest your fingers on the buttons) and that didn't work either, so I'm guessing it's something to do with touching the buttons?

The buttons do work fine, I've done diagnostic tests and it says they're normal.

I've tried tried and moist fingers, they don't touch, watch is tight up my wrist, arms are raised, I'm still. I've tried cleaning the sensors. 

Blood pressure works so it can't be the sensors ob the back either!!

I don't know what else to do!! Plz help someone.. its out of Warrenty now as well so can't even go down that route.

Typical Samsung for their products to degrade after a few years. Had problems with 2 sets of ear buds (on my third now- let's see how long they last... but hey that's for another post haha)

Thanks