Vienna fails to update rss feeds after being idle for weeks

[sati]

After being idle for about 2 weeks, Vienna stops updating its RSS feeds. Refreshing fails to work. All feeds have to be resubscribed to bring the updating back to life again. Existing channels, however, cannot be merged with the new ones, which creates a cluttered subscription list. Articles will be lost when old channels are forsaken. Is there an easy way to work around this problem? Thank you.