jecasc - 1:50 pm on Sep 28, 2011 (gmt 0)
If you believe it might be a technical issue you should check if you have some cronjobs running which slow down server performance. Automatic newsletters, log file statistics, something like that.
However this might be normal statistical fluctuations. I am sure you also have days where the average is 3 items, or the conversion rate is 13%.