The writen language of Egypt - the one we can read today - shows traces of different influences, so either there were periods of "good" and "bad" Egyiptian - like the case is with latin (actually showing that the writen lagnuage was different then the spoken language) or writers from different parts of the empire spoke in different dialects.
There were also non-egyptian people living in Egypt. They contributed to the language also - as well as the merchants did. Finiding new words - new landscapes with features unknown to them,... contributed to the change in language.
But the most common theory is that people spoke different languages - belonging to the same language groups (similar to modern day China).
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