Battery draining when phone is shut down?

[S10_User_1100]

My S10 Plus is consuming battery when it is shut down. It uses about two percent per hour while shut down. How is this possible?

I've also noticed on airplane mode with every app closed and the phone in deep sleep it losing 2.4 percent per hour or around 94mAh. 

I have tried hard reset of the phone and it did nothing. What is going on with this thing? 

[AndrewL]

@S10_User_1100: Next time you switch on your S10+, if you go to Settings > Device Care > Battery > Battery Usage can you see anything listed that is using an abnormal amount of battery?

[S10_User_1100]

Everything thing shown is as expected.

Accubattery shows the same. 

However, battery usage while off / shut down is unexplainable.

I'm going to take the phone to an authorized repair place. It's still under warranty.