So In the last months I have had 2 Samsung phones brick on me. Both same symptons. 
3 weeks ago my Work issued Verizon S8 ran completely dead. Battery to 0% and shut down. When I got back to power and plugged it in... Nada.. Zilch. 
For a sec vibrated and circle charge indicator that almost immediately went away. After that Never showed charging again. 
Tried:
Hold power for minutes.
Hold Power + Volume  for a minute
Hold Power + VOlume Down.
Hold Power + Bixby
Hold Power + Bixby + Volume Up
Hold Power + Bixby + Volume Down
Tried Different chargers and cables and wireless charging. 
All made zero change
Had to get a Warranty swap
Last night my Note 8 also drained to 0% and Shut down, 
When I got back to power and plugged it in... Nada.. Zilch. 
For a sec vibrated and circle charge indicator that almost immediately went away. 
Tried same things as above. No Change.
Had to book a claim with Premium Care. Will have a new one tomorrow. 
Don't know what's up but 2 Sammy phones did same thing in a month. Odd.....