It doesn't seem to occur at exactly the same level, but it happens at similar places on most files, that is, where the print becomes significantly thinner...and these are all files that it has printed without issue in the past.

That's part of why I'm wondering about the over extrusion, as it seems like an issue arising when the file didn't change would probably be related to a calibration issue or something similar. I haven't been able to get other software to print the tops of the cutters well due to similar problems, but on the top layer only.