Is Ship Invincibility Back?

[Chalupa]

In some ways I hope this is one of those one time glitches, but at the same time i hope it is back. I decided to launch my War Frigate (if ship type matters) and I had very low hull that was somewhere from 1-15 hull points off the coast of PdF, and staying near the coast I shot down a Storm reaper, like 3 Dreadnaughts an ogre or two and a Man o' War, without them even noticing me. But all of the fun ended when I told a friend to TP. we sailed off to kill Death Omens Black Harbingers and those types of ships, and a death omen shot us and we sunk. Has anyone else expirienced this recently.

P.S. This was on Thursday the 7th or somethin like that

-Chalupa