Problems about dungeon deserter debuff

I have a problem with it, I'm asking if there a way to know when leaving a dg will give the debuff like a warning or something else.
Today I received it three times (I'm not saying it was unfair):
1) A few dg wipe 2 guys leave party so I think is safe and leave too only to find I received deserter penalty for 30 min...
2) Party completed dungeon, leader ask us to queue again, after loading map we were in the same dungeon and it was not reseted, even the dead boss was there so there is nothing to kill or complete, I leave and another 30 minutes penalty...
3) Last boss fight, 4 guys died and one killed boss alone and died after it without looting his corpse, I think we were good and leave only to receive 30 minutes.

I'm not asking to change anything, just questioning if there a way to know when is safe or not leave the party and avoid 30min debuff (I mostly play to do dungeon so is 30min doing nothing)