Extrusion flow issue VCore 4

Just got through commissioning, first build from a kit, and everything is as square and tuned as I can get it mechanically. I'm not sure what to try to troubleshoot this.

First layers look good, then things go off the rails when I start hitting layers with infill. Remarkably, once past those layers the print continues like it never had a problem. I've tried a few (dry) filaments, and no improvement.

I'm using Prusa Slicer with Generic PLA presets.
Solution
So I did work this out; my parts cooling fan was not wired properly and was not running at ALL. Once a 4028 is spinning you really can't miss it.
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