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Incorrect/no data for a recorded activity

Hello all, 

Today I did an indoor threshold activity on a treadmill. I've been using the same treadmill for a couple of weeks and all of my Garmin activities were recorded as expected.

However, something happened today, which upset me quite a lot. The workout had a total of 4 intervals with 2 min recovery. My HRM Pro Plus connected as always, the watch was showing the target pace and time, like every other day....but in the end, only 1k was recorded in my Garmin Connect and on the watch. Why? 

I pulled the data from the HRM, but the same thing appeared. My guess is that the strap got disconnected at the beginning of the workout, but why the watch continued to show pace, etc. on indoor activity? I was left with the impression that indoor activities can be recorded with the strap only, or manually if you enter the treadmill data which is super inaccurate. 

I thought I hit very good numbers today and was very happy with my performance until I got home and checked the activity... pace 31.48/km.....for a total of 1.38 km. Very, very disappointing, Garmin!