Again, I'd like to assure everyone that there is nothing wrong with WordPress.com.
Looking at the stats for some of your sites suggests nothing is out of the ordinary. For example, fau4u, I can see that while your August stats are lower than July's, you have already had more visits this month than you did in June, and August isn't even over yet. July was a great month, likely due to a couple successful posts, but that doesn't mean you are losing traffic. In fact, August 2013 is already your second best month since we started collecting stats.
If the rest of you looked at your stats, you might see similar patterns.
Although it seems from this thread that everyone is having issues with their site traffic dropping, there are many other WordPress.com users who are seeing traffic increases (but of course they won't be posting here).
I understand that it can be disappointing to not see growth in site visits every month, it doesn't mean something is "broken".
As SEO experts will tell you, it's bad practice to compare one month with another - July and August are just not the same. Once you have had a year or two worth of stats, it will be more meaningful to compare, say, August 2013 with August 2014. You might see a natural rise and fall at certain times of the year, which may also correlate with your blog. For example, tech blogs might see spikes right before big announcements; blogs focused on films may see boosts around Oscar time; educational topics, when school starts; and so forth.
And in the end, the internet can be a harsh mistress, and there isn't always an obvious reason why one month does better than another.
I'd recommend folks read our tips for improving traffic here: