about death effect...

I just got to wonder on the stability of death effect. I have on occassions provoked multiple deaths over and over and over (mara c express). And what happens on some occassions is that I get double/triple death effects. When the timer runs out though, one is stuck with death effects that does not run out or dissappear. Now this might not be a big problem, since the death rate where this happen is like as fast as one can be revived. I still wonder if anyone else has experienced this, perma death effect?