I'm having the same issue. Reboot didn't help me. Other issue I had, my gear S3 won't fully charge in one go, I usually get a message that batter is too hot, so I keep it aside for a while before recharging to reach 100% charge. I'm gonna contact Samsung to report the matter.
Could have know this would happen, and as from now i will never update samsung products when a newer version comes out.
I have seen this with the S6 S7 and Gear S3 now.. everytime samsung releases a newer version of a product an update will show up wich makes the battery drain twice or 3 times as fast.
Its nothing more then a trick to let people buy new products because old ones become useless.
Its becomming really obvious with samsung products.
My advice: dont update your samsung devices when newer versions of a product come on the market!
I too have had no battery issues since upgrading to Tizen 3.0
A small group of people post that their battery life has been reduced adter the update and you're ready to declare that the update "makes battery life so much worse". If this were true you would be seeing a lot more complaints here about it. Are you sure you didn't do something like enable the new continuous heart rate measurement feature?
I did a reset device on my samsung gear s3 and noticed that the battery usage for samsung health drop from 45% to 3 %.
Check this out.
Looks like a solution