No manufacturer will ever admit to this, but the same things happen to certain people with all types of smart watch or fitness tracker/watch. What do they all have in common? Heart rate monitors! Those strobing lights that constantly burn into the flesh (for some people) :D. It's too common a thing for it to be caused by anything else. I've never suffered from it, but my other half does. I'm assuming it's dependant on skin type/sensitivity, etc. Ultimate test would be to give that wrist a rest for a while, let it heal. Put the watch back on with the sensor turned off and see what happens.
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I've seen loads of threads complaining about inconsistencies in the floor counting on Galaxy watches; all of them seem to be unsolved (asides from Samsung's poor effort at just telling its users to reset, recallibrate and refresh everything (oldest story in the book), standard I.T. bod "turn it off and on" rubbish :D)!! Haven't had time to look through all the threads to see if someone has spotted a fix, so this might have already been talked about...but, I think I may have cracked it! If you go into the "Alti-Barometer" app through the watch, when it's on the "Altimeter" screen you'll see a last refreshed status at the bottom. If that hasn't been refreshed for a while, the watch will either assume you're much lower than you currently are (which would give wildly high floor count reads) or much higher than you currently are (giving no reads at all for climbing stairs or going up a hill!). Scroll over to the 3rd page in the app (past the "Barometer" page) and you should see a list of settings; click on "CHANGE" and make sure you turn on "Auto refresh". Et voila! This has worked for me...I hope it brings solice to all you other Galaxy Watch users
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