Some people charachterize this as bidah. Which I dont believe, unless you make it fard, wajib, or sunnah it s not considered as bidah according to my limited knowledge. Jazakulllah
Through the experience of our pious predecessors the reading of Surah Yaseen 41 times has been known to be very beneficial in many situation. It is not a Bid?at practice until taken to be Fardh or Waajib.
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai