Frank,
If food isn't an issue, including the possibility of neighbors having planted different crops or food plots during the past year, has something happened to affect the deer’s security, or even their perception of security? With 272 acres, is it possible you have others using the property without your knowledge? I look for three things when the whitetails I hunt change their patterns: a change in food or water, a change in security (including their perception of security), and if it is close to the rut where the does are. When their patterns change I look for them as if I was looking for my son when he was a teenager, find the food, security, and women. Like teenagers, the order of importance of these three items can and will change at anytime.