Mysterious /Q Death Cause Discovered, To Be Fixed

From JGray, EQ Developer, in a SOE forum thread:

We've tracked down this issue. Essentially, if you /quit, /exit, or go linkdead, when the zone took over your character, any items that you had equipped that were unusable (yellow, or purple for augments) were having their hit point bonuses subtracted from your health. If the hit point bonuses from the disabled items added up to more than your total health, then you'd die. The fix didn't make the past patch, but should be in with the next one.