[NTG-context] unwanted page break

Dear all, I have a strange output today. Writing a sentences, it makes a page break even though there are enough space for the remaining sentences. Here are sample output.(the lines is a frame) As you see there are enough space, I think. Sometimes, the section title is located at the bottom of the page, so I put \page to make the new section starts from a new page. In this case, is it possible to make section starts from a new page without saying \page? Thank you for reading. Best regards, Dalyoung