I have been seeing this when following a course. I first noticed this two years ago and it hasn't been fixed. At some point, when following a course, the elevation profile become clipped and unusable. It seems to be fine at the beginning of a course. I can't quite pinpoint what triggers the profile to become clipped and was wondering if anyone else had a solution for this.
I have attached images of the elevation profile and what it eventually looks like during a workout.
Don't worry about the scratch. It is just the screen protector....the Fenix is fine.