Not sure what's up, but I'd agree with CCBill that it's next to impossible to track day to day patterns unless your daily traffic volume is huge. Like you I have over 6 years of data, but I don't even try to explain short term fluctuations. I use a three month running summary for tracking sales trends.
That said, I have a couple of top sponsors that are down significantly so far this month, but others that are making up the difference. Overall, I'm up about 30% YTD over 2010.
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