I take that back. Transmission still does the shudder thing. The new fluid hasn’t fixed anything. I believe it is related to humidity/ambient temps. 80 degrees no issues, been running great til today(70°F, 91% humidity, rained this morning). Out of nowhere it started doing it again.
I’ve got a couple months left on power train warranty. Once that’s up it’s getting traded in. I don’t think it’s fixable without replacing the whole trans unit.