Mine has been doing this as well but it is only my Gear S3 Frontier that has the battery drain issues getting less than 12 hours, my Gear S3 Classic is still getting about 3 days out of a charge and it has the same updates as the Frontier. Watch always on function is not turned on, WiFi is on auto, it is always bluetooth does't have its own number, and everything else as far as settings goes are just as they were when first set up with only 7 apps set up for notifications. This is set for both watches. After sending my Frontier to Samsung to have the battery replaced and getting it back with the same results as when I sent it to them I contacted them again and the guy I spoke with admitted that they know about the "faulty update and how it drains the battery" but stated that Samsung only sends out updates 3 to 6 weeks after the previous update even if there is a huge fault in the previous update that won't speed them up. So in short this seems to be only affecting the Gear S3 Frontier watches and even reading most of the posts that seems to be the only watch I see that others are saying they are having an issue with, I haven't seen one person say it is an issue with their Classic.
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