I am having the exact same issue. US model Galaxy Watch 42mm, I purchased it last fall. It recently will have days where the wake up gesture will not work, and on those days it will intermittently track steps. When this happens I double check the wake up gesture settings, make sure I am not in Night Mode or Theater Mode, etc.
I have now factory reset and re-paired this watch 3 times this week to try and solve the problem, and each time it will work for a day or so and then stop working. This morning I woke up and went to the gym, and recorded a treadmill workout. All my morning steps worked great, and the wake up gesture was fine. After I got back home, at some point I noticed the wake up gesture wasn't working, and I now have gaps in time of steps captured.
Any recommendations on how to get this fixed?
UPDATE:I also ran TESTMODE and found the same issue with my sensors - no data for accelerometer, FAIL for gyro, etc.
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