This is a very common similar issue with Mercedes Benz but due to integrated transmission cooler in radiator. I saw a lot of them kill the transmissions torque converter some how, we were seeing cars come in with converter vibrations and over filled transmissions. We scratched our heads on the first few until a customer went to dealer and came back to show us the findings. Converter, radiator, and fluid replacement Solved the issue.
^^^ But like you said about the oil filter, most people don’t prime a filter after an oil change
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