Voluntary vs. Forced Restart — Difference and Ruling

Definition:
Voluntary Restart (Ikhtiyari): Starting recitation from a chosen position — either at the beginning, or after a Taam or Kaafi stop.
Forced Restart (Idtirari): Resuming from wherever breath ran out or recitation was interrupted, even if not an ideal restart point.

Rule:
Voluntary: must begin where meaning is independent and no corrupt meaning is implied.
Forced: permissible out of necessity, but recommended to back up slightly to begin from connected speech.

Quranic Example:
Good restart: "You alone we worship and You alone we ask for help" [Al-Fatiha: 5] — sound meaning independently.
Bad restart: Starting at "Az-Zina (fornication)" in [Al-Isra: 32] without the full prohibition — not permissible.

Note:
It is Sunnah for the reciter to begin with Isti'adhah and Basmalah at every new voluntary restart.