I bought the Galaxy Watch 46mm and the same strange things happened all the time. When you stay still it measures the pulse fine when you move stops immediately. I even shave my arm, tighten the strap, little improvement, but still when you move stops to measure the pulse or get incorrect values like 216 bpm or as low as 29 bpm.
I'm thinking of returning it and trying Fitbit or Wear OS watch, there's not much more you can do. I wish I liked Iphones...
I've recently joined a gym, using the equipment I have been attempting to use my watch but it's keeps telling me to clean the sensor.
Still it doesn't work.. any ideas
Updated yesterday seems to be much better no flat lines, no ''measuring" from time to time. Also during driving my car the HR is correct, with the previous I've received values 160bpm and minutes out of readings
I'm curious to see during workout but so far so good
Fingers crossed so far. Out all over the weekend with no issues and in the gym last night on cross trainer (high impact) and no issues again there either. I've even had issues walking to work in the cold and nothing this morning either.