When you say only page 2 is left, I presume you mean the contents of what was page 2 is now on page 1. And the complete document has now only got one page instead of two pages.
Or do you mean that page 1 has become a blank page (text gone from view) and the document still has two pages?
If so is it possible that there are now actually three pages not two?
page 1 (text that you thought was lost),
page 2 (blank and you thought was page 1),
page 3 (that you thought was only page 2)
Writer should 'flow' onto page 2 when page 1 is full (just keep typing it goes onto next page automatically), is it possible wife is pressing Ctrl+Enter to insert a page that might cause there to be a blank page between the two with text on?
The only way I know of to delete a complete page along with the text, is to have all the text selected and then press delete.
I suppose it's not possible now to find out the exact circumstances (what keyboard presses etc)? or maybe you could experiment to reproduce the 'problem'.