Same has happened to my Galaxy3. It updated Tue night and from that point it has killed my battery life. It went only 5hours. I did manage to work out by going through my wearables app on my phone that - the settings app had used 53% of that battery draw, so I force stopped Settings - that has increased my life to almost a day. Overnight again I've also noticed that now it is automatically turning on the WiFi on my phone - I've read this might be linked to the weather app. However, overall - battery life is still buggered. Since 7:30 am this morning until now 10:21 --- it has gone from 100% to 51%. Really peeved about the latest update and I would love for this post to get some developer / Samsung attention for resolution. Also I would love for any live chat option on samsung website or any of their phone numbers to work. Can't get those to work either. Is there any help out there at all !!! Otherwise I expect I'll probably just try a factory reset and reject any software updates.
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