All time under attack
That’s not helpful. You kinda need to give substantially more info for help, AND you need to actually talk to perblue, not the forums.
If the player disconnected during the battle, it’s the same behavior as Creep Surge - the boss will show as ‘under attack’ for about 10 minutes until it resets.
Oh, this happened to me, I waited a looonnggg time, then I left the game and rekpened it to find it ifixed.