Then try different tightenings at your wrist. When its to loose, the sensor can‘t get good readings. But also when it‘s to tight, the blood can‘t flow as ist should. This could also cause bad readings.

Trust me, I have done all this and more, but it stays the same. 

Had Fenix 3HR and 5, they worked properly  

Post activity battery drain on Fenix 5 plus tooks 9 mouth to solve it... it was like a birth 

F6x pro

After updating the SNS and GPS (the SW version has not been updated. Today it is 2.30) SpO stopped working. Writes "version mismatch. Update SW"

Who faced ??

  How to treat?

It is working now but still comes on all of the time so enabling seconds must be pretty sensitive and kind of defeats the purpose as it tends to be on all of the time. I wish Garmin would give is the option to disable seconds manually like other watch faces. If you are reading this garmin please enable this on your native watch faces.

Only issue I am having on the watch face besides the second hand being very sensitive is the H / L weather is not displaying now even after syncing with GC  

I am enjoying my 6x sapphire and been a big garmin fan for a long while. 

Doesn’t work for me either. Second hand is permanently on. 

My 5x had this problem prior to me selling it. I fixed it by doing a factory reset and then reloading each and every single map on there via Garmin connect and manually for the maps I'd added outside of Garmin connect. 

If there's an update and you disturb it while it's downloading or copying it can cause problems like this.