Same happened to the round sensor back on my Galaxy Watch. I contacted the supplier within the warranty period & they told me that it was my fault & I would have to pay for repairs (which with postage would have cost almost the same as a new watch). It was certainly NOT MY FAULT the back fell off. It happened when we were away on holiday out walking & I didn't realise it had gone until we arrived back to our accommodation. There was some slimy sticky stuff on the sensors, so I tried putting some clear sticky tape on the back. I figured this would cover the holes in the back & stop sweat and dirt getting inside. I wish SAMSUNG would repair or replace the watch, it's definately a manufacturing defect.
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