This has probably been asked before ...but

Evidently for presently not understood reasons, occasionally but rarely some people under deep general anesthesia with no brainstem or cortical responses have their spirit consciousness disengage from and separate from the dormant or switched off brain structures that were housing it. The Pam Reynolds case is probably the best documented. When the suppressed spirit disengages from the dormant or shut off brain structures it regains a much enhanced form of consciousness.

What causes the spirit to disengage instead of playing shtum and sitting quietly until I am revived? 

I don't expect an answer, but it would be fantastic to know more about this. Could we ask such detailed questions of a being of light? Maybe we are no longer interested in such trivia when in such states?

What causes the spirit to disengage instead of playing shtum and sitting quietly until I am revived? 

I don't expect an answer, but it would be fantastic to know more about this...

Lie down on the floor. I'm serious................

Shut your eyes, relax........................................................now get up. You weren't ready to die, it's not your pre-planned time. Spirit (etheric) disengages when it is the right time, not a second sooner, not a second later.

What causes the spirit to disengage instead of playing shtum and sitting quietly until I am revived? 

I don't expect an answer, but it would be fantastic to know more about this. Could we ask such detailed questions of a being of light? Maybe we are no longer interested in such trivia when in such states?

We just don't know, or even have a clue as to what the mechanism is (assuming it is a mechanism).  It just looks very much like this is functionally what happens. I can imagine several kinds of possible answers. Perhaps the brain mechanism that enables the brain to manifest and house ultimately nonlocal consciousness has a "back door" that can unlock the temporary binding of consciousness to the physical brain structure. This "back door" module would have been built in at some very early time to allow spirit to disengage at will. As humans developed and human spirits became more and more earthbound and locked into the brain during physical life, this feature became mostly nonfunctional, dormant. Today, this "unlocking" only happens on the rare occasions when either the soul decides the human self needs the NDE experience, or when the unlock module happens to be triggered by injury or drugs. Just a hypothesis to play around with.

We could certainly ask such a question through a good psychic medium, but I wouldn't expect too much. The "channel" of communication could be too noisy and distorted to transmit such detailed information (usually mediumistic communication is very unreliable), or the communicated-with entity could be at too low a level to know, or as you suggest no longer be interested in such "trivia". Another possibility would be that the "powers that be" have decreed that we are not supposed to penetrate such mysteries. Or maybe I'm being too pessimistic.

Lie down on the floor. I'm serious................

Shut your eyes, relax........................................................now get up. You weren't ready to die, it's not your pre-planned time. Spirit (etheric) disengages when it is the right time, not a second sooner, not a second later.

So does everyone who has an nde plan them in advance, or are some of them mistakes like we talked about recently?

So we have free will, but the time of our "death" is set to the exact instant? Methinks it may be a little more organic than that.

So does everyone who has an nde plan them in advance, or are some of them mistakes like we talked about recently?

I would consider the experience of an NDE to be "a major theme" being explored in a Life so, Yes. The Life Plan always includes the major themes ("being married, son dying, friends befriended, business failure/success, etc.) and there are no mistakes. There are no "missing themes".

So we have free will, but the time of our "death" is set to the exact instant? Methinks it may be a little more organic than that.

Not organic at all, very simple.

The instance and all other attributes of a death are pre-planned as they must be in order to have the exact experience you incarnated to have.

Major theme exploration is the "hall" that you have pre-planned for yourself, free will is the way in which you explore those themes. You can walk, run, slide, crawl, wobble...you can take a side door...you can pass along that hall anyway you choose but pass the hall you will.

We could certainly ask such a question through a good psychic medium, but I wouldn't expect too much. The "channel" of communication could be too noisy and distorted to transmit such detailed information (usually mediumistic communication is very unreliable), or the communicated-with entity could be at too low a level to know, or as you suggest no longer be interested in such "trivia". Another possibility would be that the "powers that be" have decreed that we are not supposed to penetrate such mysteries. Or maybe I'm being too pessimistic.

"usually mediumistic communication is very unreliable" is true only if you are working with crappy mediums. No one can decree that information that exists within you - which is where all information stems in physical reality - is unavailable to you. It cannot be.

Whether that information is relevant or not to your incarnation and the exploration of the major themes in your Life is the only conditional factor. If it is, then you will have it. If it is not, you don't need it. I'd like to fly by flapping my arms but I don't see the relevancy of it.

Not organic at all, very simple.

The instance and all other attributes of a death are pre-planned as they must be in order to have the exact experience you incarnated to have.

Major theme exploration is the "hall" that you have pre-planned for yourself, free will is the way in which you explore those themes. You can walk, run, slide, crawl, wobble...you can take a side door...you can pass along that hall anyway you choose but pass the hall you will.

We can discuss with a little more clarity on the other side.