I'm not exactly sure what you mean by "remember the text". XL should not be randomly losing the data you type. If you want the same data in the next cell, you could use a linking formula like:
=A2
If that's not what you are looking for, could you elaborate on your problem, maybe show us an example of what you mean?
What I mean is when you type in a word/name ie Alice and then you write it again a few times excel should know you are writing alice when you start typing a and then you dont have to type the rest in, it does it for you.
One one of my documents its not doing this, and would be great if it could like my other documents.
In addition to what Narayan said above about Autocomplete, Autocomplete only works when there is a continuous range of cell with values in the range above the active cell.
If there is a blank cell in the range, Autocomplete does not look above that cell for Autocomplete values.