In the forum of German allesebook.de, information was provided that there is a checkable PDF reflow bug with the T2 which hasn't even been fixed with the T3.
It can be seen (for example) with the PDF version of
this IBM redbook, but exists with many other PDF files, too. Just go to page 10, change the font size to 3 (the one right to the standard size) and the page will end with "registered trademarks of Texas Memory Systems, an IBM". The rest of the page, namely "Company. [...]" will disappear, and next page already is page 11 "Preface".
Although Sony emphasizes the PDF abilities of its readers, only the old T1 seems to be free of bugs. The T2 and T3 suffer from a bug that will make it impossible to read PDF text information in reflow mode, because parts of the text might simply disappear.
Even if it might not make any difference, because Sony isn't much into firmware updates, please report to your Sony support. It will you cost only an email.
Maybe a noticeable number of emails on this subject will help to get this bug fixed. (And don't except the answers from the support to reset your reader or to check your firmware version or that this is a special problem with this document. Chase it up. This is neither a problem with your reader nor with the PDF, but the Sony reader software which has to be fixed. Neither the T1 nor - as known so far - any ebook reader of any other company allowing PDF reflow suffers from this bug.)