Was in a Devil's Assault earlier and discovered my and the other 2 arcanes' DoTs (both eladar's and niac's) were being removed soon after their application.
On the second boss (who still constantly teleports!), I figured I was just missing the re-application due to him teleporting again too quickly, but on the pit fiend it was quite pronounced and they'd disappear with a good 10 seconds left on the timer. Never even built up two charges.
No druids, no crushing wave procs that I saw (and I was almost constantly inspecting; only closing and re-opening the window when it stopped updating), just an AA Ranger.
Was only EH so over too soon to be worth complaining or investigating, but curious if that was the cause or if there's another alternative.