Yup, I'm having the same problem (@wcarle)
Connection log of my bot's 24 hours prior to a ban http://paste.ubuntu.com/25465253/ (ban begins line #3212). It seems to be within the rules - no more than 200 requests per hour or 1 per second. I average out under 3 requests per minute.
The only thing I can think of is the XML feed is more trigger happy than the API? Of those 3 requests, one is to the mashup feed.
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