Embedded report prints without data

I have several BI publisher reports (pdfs) that appear embedded in a dashboard.  I have noticed that after the report appears in my dashboard and I click on the print icon right away the report prints fine.  However, if I wait a few minutes after the report appears and then click on the print icon, the report prints but without any of the data.  It has all the labels, boxes etc. but does not show any data.  The reports have groups that pull data using SQL statements as well as those based on a BI analysis.  And the print icon