battery draining fast issue while device in idle

[GM1985]

Hi, am facing battery draining fast when in idle in my galaxy s8. i have charged 100% before going to bed and morning battery drained 25% in 10hrs. I have done all the settings as recommended like switching off location,Wi-Fi, Bluetooth, sync off, always on screen & everything but still having same issue. attached screen shot for reference. I can't able to find reason in battery usage history. pls help me to resolve this issue. my device is 2 months old.

[Karkeyr]

This happens after the October security patch.

[GM1985]

my Friend is also having same mobile with same patch level but he is not facing this problem..

[Karkeyr]

I did a factory reset also. Nothing works. It's draining around 15% in 8 hrs for me during standby time.

[admin_]

"Thank you for Joining Samsung community. We would recommend taking some troubleshooting steps to further isolate what you may be experiencing.
Find troubleshooting steps on provided link http://www.samsung.com/in/support/skp/faq/1101689. Please let the community know what steps you have taken and if you have noticed any changes or improvements. This will help the Community to provide you steps without repeating any steps you may have already taken. Be sure to hit ♡ when you find an answer that works for you."

[GM1985]

I have done the below settings
1.always on display turned off.
2.infinity display turned off.
3.Wi-Fi turned off.
4.location turned off & location method is in battery savings.
5.auto sync disabled for all accounts.
6.Bluetooth & nfc turned off.
7. brightness is in automatic.
8. network mode for slot 1 is lte/3g/2g auto connect & slot is in 3g/2g auto connect.
9.hotspot is turned off.
10. factory reset also done.

after doing the above settings also am facing the issue. if I put my mobile in flight mode then 3 to 5 % Battery draining.. if I enable both the aim cards then am facing 20% Battery draining in 6 to 7 hours when mobile is in idle.

[sp123]

I recommend using max power saving mode at night.I use it on my s8 and lose around 5% of battery