http://www.thok.org/~burnbeforereading/index.rss hasn't changed in years, and it's been fine since I added it when I first signed up for newsblur in 2013... but now, I keep getting most or all of the entries showing up as new every day or so (new behaviour that started in the last week or two.)

The likely-interesting bit is that the feed only has rss/channel/lastBuildDate, none of the items has (or has ever had) timestamps...