@cedric13 There seems to be S7 quality assurance issues but maybe that’s bias because there is small sample size from amount sold. I wonder how many are out there with insanely bad altitude issues. Mine was doubling altitude out of the box and reset did nothing. If it wasn’t for the GPX files that I preloaded, knowing the elevation, I would have no idea mine was faulty. I think there should a survey going out and a recall in order.
It’s a great design that’s almost impossible to cover the baro hole so that’s not the issue.
I tried sideloading a alti/baro calibrator app from XDA and I can post the link if you are interested. It didn’t help my situation at all though. The app detects when there is unusual pressure on your baro which is cool.
A good way to troubleshoot it would be to do a peak hike (only up and down) then analyze it in Quantified Self. My specific problem was very wavy stats. So if i was walking up a hill every 2meter (for example) vertical I walked, it would go down 2m then go back up to 4m leaving me with 4m up (ascent) and 2m (descent) down while it was just 2m up in real life. It was accurate on my altitude points like (min, mid, max), I know this because i was at a ski resort and it had signs telling me what altitude i was at and it says it on the gpx file as well.
I just sent mine in a couple days ago. It was a very easy and smooth process which is free. It took 2 days to get to finland from a small town in france.
I’ll comment back on here what the solution is and when I get mine back. But this is the solution you should do. It’s a 400euro watch you should just get it looked at. But make sure to give them an insane amount of data (crossing my fingers that i explained it to them thoroughly enough)