Forerunner 935 will not save workout data

I have a new Forerunner 935.  I use it with both the Garmin Tri strap and an Ifit strap when on treadmill.  My last three workouts when completed I push save  and it gets into a loop of saving the never stops unless i plug it into the computer.  But it does not save workout data.  My 920Xt works fine on bike rides.  The 935 work for the past month with no issue.  any suggestion.

I would like to know if Garmin will repair my running strap (red cover) which stopped gathering data after i changed the battery.  This is the third strap that malfunctioned after changing battery.