Praise be to Allaah.
What is mentioned in the question is completely wrong. The person who dies suddenly is just like anyone else who dies, for whatever reason: his soul leaves his body, and the soul is a matter of the unseen which is known only to Allaah. Some groups of innovators (followers of bid’ah) believe that when a person dies, his soul moves to another body. This is known as tanaasukh (transmigration of souls), and this belief is something which is known to be essentially false according to the religion of Islam.
Shaykh ‘Abd al-Kareem al-Khudayri.
This is appalling kufr and falsehood, and is one of the results of denying the torment of the grave. We ask Allaah to keep us safe and sound.