Feedburner Statistics

My feedburner statistics are fluctuating wildly over the last week or so. For example today I seem to have about 400 less of you than normal. It seems to want to return to normal but then drops back down again. Anyone else noticed anything. The only thing I can think of is Java script is playing with the statistics but I've always had a bit of Java action going on in the templates and also post from time to time.