This is in Sycrekea Specifically as its what happened to our group today....

Before Wedsnesday's (16th) patch, you could enter & re-enter the boss instanced room freely if needed - reasons that this may be needed;

- Party member crashes, they reload into the entry room, rejoin party and then re-enter instanced boss room

- Boss is on its weird cooldown and wont spawn, whole party will need to leave instanced boss room, change server and re-enter. 

Well Guess what, our keys were deleted upon ENTERING the instancted boss room not on BOSS DEATH/DUNGEON COMPLETION.
So when one of our party members crashed, reloaded into entry room, key deleted.
No 5th person now to complete dungeon.

We have to re-start the dungeon from scratch.
Wasting everyones time. 

Please fix.