Is the cause of recurrent miscarriage after a second marriage, despite normal medical tests and commitment to acts of worship, the evil eye, sorcery, demonic possession, or the theft of the fetus by jinn, and what is the expected solution and treatment?

Everything that afflicts a Muslim of worldly calamities is compensated by God through the expiation of sins and the forgiveness of transgressions. One must surrender to and be content with God's decree, exercising patience and reliance upon Him. This does not contradict the adoption of lawful means and measures to treat illness and lift affliction, such as legal ruqyah. There is no harm for the questioner, if she suspects she is afflicted by magic, to seek ruqyah from someone known for their righteousness and piety.