Automatic body scanning? What is happening here?
This automatic body scanning that you mentioned is your ego playing games with you. During meditation, your Self or ego is becoming weaker and weaker. When the ego sees he is dying, ego will do everything to not die. You could hear sounds, vibrations, gain supernatural powers, travel to distant galaxies, predict the future, read minds, gain magical powers, fly through walls, visit astral planes, talk with devas, have out of body experiences, etc. 

Ego wants you to cling onto something. Ego wants you to crave. That's why he gives you weird experiences. If you show fear to such experiences, ego will give you experiences that you'll be afraid off. If you show attachment to such experiences, ego will give you experiences that you'll be attached to.

The important thing is not to get attached to these experiences and get beyond them. Don't worry, if the experience arises, just go with it, enjoy, relax, have fun and don't intellectualize. The most important thing: never, ever be afraid. If a bad experience arises, smile, don't worry, just go with it, enjoy, relax, have fun and don't intellectualize.

The closer you will be to liberation, the less such experiences will arise.