I just pulled my cards after a week and lots of does, but only a few bucks and none of the bigger ones.
I have seen this same drop off the last 3 years (since I put up the cameras). The bigger bucks disappear in the beginning of September, and then it is really sporadic from here on out.
Other factors that may have contributed to it were the start of dove season (shooting of bird guns in the corn field adjacent to my spit of woods, the harvesting of some of the corn, and the hot, dry spell we have had here for the last 2 weeks.