@Silviu-Adrian-Moise Hello, I’ve had the same problem since yesterday, the altitude is going crazy even when stopped, and counting the ascent. And not just when active, even when staying at home without moving the altitude goes up and down. I already had the problem several months ago, and after trying everything, I had to fight with Suunto to get a replacement. So now I’m doing a test today, and it’s going back to the store.