Frames don't 'just' happen. Perhaps you are applying a style which has a frame included with it.

If you apply a style and a frame appears/disappears then you can see what style has a frame setting. So you can modify that style to remove the frame.

If you can't work it out, post a sample document and someone can have a look and work out where the frame is coming from.

__________________
Andrew Lockton
Chrysalis Design, Melbourne Australia