I just started playing Diablo 3 hardcore mode about 2 hours ago with a hardcore Demon Hunter champion. All good and safe until I got a random, out of nowhere disconnection error while for certain, I had no issues with my internet connection whatsoever. After I reconnected, I found out that my champion is dead and as far as I know you will nor revive hardcore champions for any reason, but this is not my fault and I wish to have my progress back as it was not one of my mistakes. I did not disconnect my internet intentionally or do something to get out of trouble or enemies in the game. I am slightly troubled by this issue!
I did not find the right solution from the internet.
https://us.battle.net/forums/en/d3/topic/20762116287Digital advertising company