What can I do to stop this?

[Nyghtmarerobu]

On the other end of the spectrum, since I always play a healer I wonder if I switched to tank would I see similar problems in healers that queue? What is the tank experience with healers?

Its not as prominent, but its usually due to a lack in dps, or they don't like the way I pull and use my CD's. These things can tend to make a healer bail, as they see it as being a slower run than normal, even if its only by a few minutes...

In any case, I have a question that's more out of curiosity than anything else. If someone drops from your duty and the ranks are replenished to reform a full, light party again, will anyone still get a penalty for leaving?

If the ranks get filled, the next person to leave will get a penalty.