I have had a Garmin Vivoactive 4S since 07/2020. I run a lot in the woods, but since January my speed and therefore kilometers are no longer correct when I run under trees. At the smallest tree my speed remains fixed at, for example, 9.2 km / h.
If I compare his mileage with my running friend, it quickly saves 500m on a 10km run. The time per kilometer is no longer correct for me. I have no problem with a road run. I got a new one from Garmin under warranty, but the same problem occurs here.
I have already changed GPS separately and + glasnoss and + Galileo, but this does not help.
What could this have to do with? I haven't had this in more than half a year. Then it worked perfectly.