Oddly enough, all of those incidents are from the SAME flashpoint run. When we finally finished the damn thing, I vowed never to run Athiss again, or at least to never run it as the healer. That flashpoint is annoying to run as a healer even with competent players.
Strangely, I've vowed never to run Hammer Station again with pugs, which is ridiculous because it isn't hard. However, the very simple mechanics of the final boss seem too much for the average levelling player and I've lost count of the amount of times I've wiped there because of sub-standard healing or dps who stand in aoe and ignore the adds.