Reciting Qunoot-e-Nazilah is an absolutely authentic practice. If a calamity (Nazilah) befalls the Muslims, it is prescribed to say Dua al-Qunoot after standing up from Rukoo in the last Rakah of each Salah, until Allah (swt) relieves the Muslims of that calamity.
In fact, this Sunnah is still practiced in many of the Arab countries.
With regard to saying Dua al-Qunoot in Fajr prayer all the time in all circumstances, there is no Saheeh report that the Prophet (sa) singled out for Fajr for reciting Dua al-Qunoot all the time or that he always recited in Fajr prayer.
Rather, what is proven is that the Prophet (sa) used to say Qunoot at times of calamity only, with words that were appropriate to the situations. This can be done in any of the five obligatory prayers.
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