Hello Astral Walker,
Thank you very much indeed for your kind comments on my book
And congratulations on your Astral projection successes! There is no doubt at all that Astral projection and OBE are extremely valuable abilities and life changing as you have discovered. I hope that millions of people will eventually learn these abilities, or more specifically re-learn, because they are natural abilities, and that will have a profound effect on the direction of mankind. And it will happen.
As for your question, I think it depends on many factors. We certainly "forget" that we used t project in a previous life just as we usually have no knowledge of anything else unless we retrieve it by directly accessing the information through the appropriate methods.
However, many people can AP and OBE naturally, almost at will, and that is almost certainly a "carry-over" from a previous life even though they do not remember it directly. This leads me to believe that once learned it becomes more likely to happen in the next life. These abilities are also about Energy equilibrium. Those who, through the process of perfection can bring their Energy Body into balance through the chakras can project much more easily than those who are Energetically unbalalanced.
Ultimately the "decision" might be that of the "Higher-Self" which is really the "Inner-Self". Our Higher-Self has a complete perspective of all lives and our entire existence; keeping in mind that "time" does not exist beyond the physical world. So if it is appropriate to learn Astral Projection and/or OBE then the Higher-Self will send those messages. It is for then for us to hear them at a physical level.
So in answer to your question; although there is no direct memory recollection of AP an OBE abilities from a previous life, the chances are there will be a tendency to pick up where you left off by "discovering" these abilities early, under the guidance of the Higher-Self.
Best regards,
Adrian.