Arif Shamim wrote for ISLAM: THE TRUE HISTORY AND FALSE BELIEFS by Shabbir.
HOW QUICKLY WAS THE RITUAL SALAAT CHANGING!
Bukhari Vol.1, Book 10, Number 507: Narrated Ghailan: Anas bin Malik (A Sahabi) said, "I do not find (now-a-days) things as they were (practised) at the time of the Prophet." Somebody said "The prayer (is as it was)". Anas said, "Have you not done in the prayer what you have done?"
Bukhari Vol.1, Book 10, Number 508: Narrated Az-Zuhri that he visited Anas bin Malik at Damascus and found him weeping and asked him why he was weeping. He replied, "I do not know anything which I used to know during the lifetime of Allah's Apostle except this prayer which is being lost (not being offered as it should be)."
The comments, "Have you not done in the prayer what you have done?", and the "Lost Prayer" indicate that something went wrong with the Ritual Prayer (Namaaz) soon after Sahaba Kiraam.