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After a quick check of my log files, I see this happened in late October, mid-December, late January, early February, mid-March... and now.
For a bit there, I thought I saw a semi-regular pattern of Slurp goofing up every 1.5 months, but I'm not sure if that theory holds much water.
What I did notice though, was that Slurp often asked for the same files. It took no work at all to find most of the original pages, which included porn, a religious cassette tape, a small town in Germany and someone's coat of arms.
At the end of the day, Slurp's abberant behaviour isn't anything to worry about, it's just a few 404's in your logs.