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Not sure you have the same problem but will share this story:
I went through something similar with my Dodge 1500 with the 5.7. I found I had a bunch of carbon buildup in the pan which would eventually clog the oil pickup strainer. Shutting the motor off allowed it to fall back into the pan. I confirmed this with a USB boroscope in the pan through the drain hole - was able to see carbon chunks everywhere.
They did something goofy in the design of those motors - the PCV valve is integrated right into the intake manifold and close to the EGR intake port, so you get a bunch of carbon somehow makes its way back into the oil.
Dropping the pan on my truck is a major PITA - Ran some motor flush, drained it, put a tube up the pan drain hole and pumped in a some kerosene. I was able to flush out a handful of carbon buildup. I've run a motor flush every oil change since without any repeat of the issue.
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