I have had my Forerunner for a few months now and had no issues. But for about the last 3-4 weeks whenever I record an activity - hiking, walking, running or trail running it isn't measuring my elevation.
If there is no workout being recorded it is still measuring it correctly.
I have tried all the normal things - reset, calibration, submerged in water to check the sensor isnt blocked etc.
Anyone got any ideas please?