My samsung galaxy watch sensor on back stopped flashing and now wont detect my sleep or heart rate

[Members_JEf0JfV]

Hi my Samsung Galaxy watch has suddenly not letting my sensor work on the back. Therefore it's not picking up my heart rate or sleep. Any ideas tried every suggestion in settings still nothing. I've cleaned the sensor put it right on wrist but still no flashing green light.

[TechZilla1]

Have you tried switching it on and off? Do you have battery saving modes of any kind selected? Updated to the latest firmware? If nothing else works try factory reset. Otherwise you may need to claim under your warranty.