Why does my TomTom Runner 2 always measure the first mile of every run about 20-30 seconds fast? This is 90% of runs. It’s really frustrating as obviously my average pace is then always wrong, and if I’m doing a tempo run it may say average 5:20 per mile, but it would actually be slower. However I won’t know the exact. Anything that I can do, or is it something I just have to live with? I used to have a Nike watch and that was exactly the same.