I have a Fenix 3, the second replacement in 7 months and after all the hassle with the app update and unbelievable customer service delays in answering the phone etc etc, it has started to under-count my steps. For 7 months a mile equals approx 2000 steps, but now my regular 4 mile route, has gone from around 8000 to 5900 steps? What's wrong now, My legs haven't grown, the count sensor is knackered?
Any other ideas or solutions, before I hand it back for a 3rd replacement?