Thank you for the quick response. I am using high page values currently, so that is probably why it is occurring. Once my data collection is caught up it should resume as normal.

in conscientious use of API I do see text about not making the same call multiple times within a minute. Like a call to questions. But it also states that making calls to another page should be OK, and that is what I am doing, stepping through pages.

I've just confirmed that this isn't happening with serverfault or superuser API calls. Only stackoverflow.