The Samsung Gear S3 Classic and Frontier smartwatches currently receiving a new software update. According to the Changelog of today’s update, the stability is improved again when charging the battery of Gear S3 or The Gear S3 Classic and Frontier have software version R760XXU2CRH1 and R770XXU2CRH1 respectively. And the size of the update is approx 12MB. If you have Gear S3 so you can check the update and install on your smartwatch.
About Gear > Update Gear software in the Settings.