Phone keep restarting

[Whothisguy]

1. Since my phone update to ui 6.1 the phone it keep shutting down by itself time to time.
2. No its the 3rd party app.
3. My battery is fine.
4. I factory reset and have no 3rd party download
5. So it keep doing it.

[BandOfBrothers]

Factory reset is the deepest troubleshooting step you can perform @Whothisguy , however please also try these. 

• 1. Clear Cache Files from the phone's System Partition Section  > https://www.samsung.com/uk/support/mobile-devices/how-do-i-clear-the-cache-on-my-device/ You may need to insert your earphones or hook upto a powered On Laptop or use a Tv's USB Port to access the Clear Partition Section. This may help with lag or stutters as this clears the phone of old/unused or broken cache files.There is also a Repair Apps option in the Menu System too { Possibly excluding the s²⁴ Series of phone's } 
• 2. Safe Mode  > https://www.samsung.com/uk/support/mobile-devices/how-to-start-my-galaxy-device-in-safe-mode/ turns off downloaded apps and themes etc which may highlight an app or theme that's causing conflict. Alternatively long press the power off button and then long hold on Turn Off to get to Safe Mode. 
• 3. When Factory Resetting do not use your back up to restore the phone. Instead set it up as a new phone and then see how you go. 

If i can be of any further help please don't hesitate to ask  😎 

[Whothisguy]

I factory reset setup as a new phone still doing the same. Now i restore everything exept i lost all my download files, music and photo. Now still doing it. Since this stupid update my phone dont work properly freeze and restart