"Guaranteed" traffic dropped for no reason

Two of my projects that are ongoing for several months have traffic dropped for no reason - I did not change anything. So instead of growing is actually going down.
Please see the attached print screen and fix it.

If you just look in the bottom of the screenshot you will see 3933 hits/day for Small Economy and in the graph you are clearly getting more than 6000 every day.

So you are getting tons of free traffic in fact.