I have started using my Vivosmart 3 tracker while boxing and have noticed that while I activate a cardio activity before I start the session is abruptly ended before the session is over. I believe it may be that the boxing gloves may be exerting pressure on the tracker and thus stopping the session. I have tried wrapping my straps around the watch, with no success and turning the face to the inside of my wrist again with no success. Short of acquiring an external HR monitor is there anyone else that came across this issue.