flv stream stops

Hello,

I'm trying to record about one hour of a continous flv stream from:
www.getv.org
I'm using the Firefox internal downloader, (I also tried Download Studio which didn't work as well as the internal download mgr)

I click on the taskbar icon, (set to autostart download) and I select one of the two streams displayed
( one of the streams low-res version, which I don't want)

I start the recording and, after one hour, pause the download and close the browser - so I can rename the file and play it.

Recording is good - but it's only about 16 minutes long

Can anyone tell me why this recording just stops ?

Thank you,