Dr. Marawan Shahin, Professor of Hadith and its Sciences, Faculty of Usul Ad-Din (Theology),Al-Azhar Univ. states: “The falling out of one’s hair during Ihram does not affect Ihram or the validity of one’s Hajj if it is not done intentionally. in this case, we are also not required to slaughter hadi or dam or to pay any expiation as long as we have no hand in the falling out of hair or it is not done intentionally.
Allah Almighty knows best.