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Page Viewer goes blank after about one minute


Hello, First of all let me say that I am a newby to SharePoint and this web Parthas helped me out, but I seem to be having an issue that i cannot figure out. I have successfully connected the web part and when i click the select icon in the list it successfully updates the viewer...only after about a minute or so the pdf disappears. I enabled the "show URL" to see if that changes when the pdf disappears but it does not. this tells me it is not loosing the pdf url. Any ideas onwhat this may be?
Also this may or may not be related but any ideas on how i can make the list title be what triggers the sending the URL to the page viewer as opposed to the little relational icon that is in the select column?
Any help will be greatly appreciated.