Does intentionally pausing recitation of Al-Fatiha invalidate the prayer for the worshipper to determine which prayer he is performing?

If a worshiper is distracted and forgets the exact prayer, whether it is Dhuhr or Asr, then if he remembers before performing an action while in doubt, he should proceed based on what has passed of his prayer, and his prayer is valid. However, if he performs an action while in doubt, his prayer becomes invalid according to many scholars. A slight pause during the recitation of Al-Fatiha does not break its continuity. As for a long pause, it does break its continuity, and the prayer must be repeated.