I also have a problem I posted this on another members thread -
I have also had this problem, I have not changed many settings since day 1 of owning this phone - nfc data bluetooth & sync off, Wifi scanning all the time only when charging & drains so much during the night! Last night I was on 42% at 21:50 then at 22:50 it was on 23% then at 23:50 it was on 15% & at that point I put ultra power saver on, which said I would have 1 day of power left.... I checked again at about 01:00 & my phone had run out of battery & shut down! Today I am taking back my phone to the shop & am demanding a new handset, I think I may have just had a faulty S5? Also my phone was getting quite hot at night in my pocket & also had a problem sometimes when powering on with the power button to wake the phone nothing happens & got stuck in ultra power mode a few times & rebooted? Other than this I love the S5 & hope my new handset is perfect? IT BETTER BE?
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I sent an email to support, they told me to bring the device to the lab to get it checked....
cant they just give me a new one and thats it? -_- ughh