LJ 2300 printing mutli pages on single sheet of paper

I have an HP LJ2300l hooked to the network via a JetDirect. Last week the Lj2300 started printing multiple pages of text on one sheet of paper. Had been working fine for months. If you had a two page document, I would print both pages of text, one on top of the other on a single sheet. I was able to work around by changing the Windows print queue properties to send the print job strait to the printer.
Any on else have a problem like this? I’m not real comfortable with the current solution. I would like to know what caused it to happen in the first place.