Fenix 5X Wrist Heart Rate goes extremly hight at certain movement grade.

Hello,

today, i did a test of the wrist heart rate from my new f5x, against my old f3hr and an edge1000 paired with a hrm-belt.
First of all here are the links to my activities
f5x https://connect.garmin.com/modern/activity/1694388412
f3hr https://connect.garmin.com/modern/activity/1694412985
edge1000+belt https://connect.garmin.com/modern/activity/1694398133

If you look at the HeartRate-Curve, you see the fenix 5x has problems, especially when i am going at a certain steady grade upwards.
It shows me nearly 50 more beats than even the f3hr or the edge1000+belt.

Overall the metrics for HR are totally messing up the results.
The f5x says me 2,4 TE AN. and 2,7 TE A. The average Heartrate is 92BPM.

The old f3hr performs much better and more consistent in comparison with the edge1000+belt.
Average HR is 85, edge 1000+belt scores 84. TE A is 1,5.

I think there is a bug with the wrist heart rate of the fenix 5x, when you are moving at a certain steady grade upwards.
If i come back to more plain movement, the f5x is very close to the f3hr and the edge 1000+belt.
It goes crazy again, if i am back on the certain steady grade upwards.
I couldn't figure out, if there is also a bug, when you move at a certain steady grade downwards.
But i bet, it will also behave corrupt.

Are there any owners of the f5x, who are experiencing the same?

Well, i guess i have to contact Garmin to get a replace watch.

Any comments are appreciated.

Thanks

Michael