i have noticed that almost all of the klingon battlecruisers you go up against in the missions and even the DSE's, have no engines, no shields, no weapons, nor do they generate an earth-shattering kaboom when you blow them up
I think its a problem with there programming. I turn a ticket in on it best if you do the same. It only seems to be the Vor'cha class. they have done the same thing before with the bird of preys, it took time but they got it.