So download Window is open all the time, that’s fine.
Collection interval 900s = 15minutes, so every 15 minutes Windows client will try to connect to CMS for updated media/schedule etc. + all the changes ‘on the fly’ while the layout is running.
I assume that you have other media files in your layout, the region with longest duration is important:
So the link above, regarding duration of your layout and try to maybe lower the Collection Interval to lets say 60s for test and see if that will change anything regarding your rss feed updates.
If not, then I’ll ask to export your layout so we can test it in our test environment.
Thanks