Who's claiming reshoots one month out though (as in right now)? Google says there were some in July (sounds pretty normal) and maybe some at the end of September.
Timing makes sense as stuff comes up in the editing process. Marcia Lucas famously saved the finale of this little 1977 film called "Star Wars" in the editing room using off-screen dialogue and repurposed canned footage, if not full "reshoots."
http://www.justinkownacki.com/good-film-editing-save-movie/
Think of how much lower the stakes would have been without the Death Star being about to imminently fire on the Rebel base on Yavin IV!