This has happened a few times now and is really frustrating. Last week I did a 5 mile run and registered only 47 steps, today same 5 mile run 1500 steps (I obviously have a large stride). I've reset, connected via USB, checked activity tracking... it still happens. In fact I reset an hour ago and registered a grand total of 0 (that's right zero) steps. Can anyone help, is this a software version issue? Can it be fixed? or will I be forced into the realms of a non-Garmin watch (I hope not).