HI, Twice now in two very different locations the GPS distance has stopped working on my instinct. The speed works as does the timer but not the distance. To try to make it work I stop the activity, then try to save it but it just freezes on the screen. I hold the power button till the watch powers off then back on. The first time the GPS didnt work for over a week but then magically started again. I am hoping this wont be the case this time. does any one have any tips? Thanks