Okay coming on back for anyone reading this with possibly the same issue. The suggestion of twisting the wire pairs looks like it has fixed the issue so far. I have a 6-wire stepper cable that adapts on down to four to the Duet. I took an extension out since I really didn't need it, then popped the wires out of the molex connector two at a time. I then twisted those, putting them back into the ends when done. I ended up with 3 twisted pairs.
Hooked everything back up, have run 3-straight days of prints and am back to boring flat temp lines and the MFM hasn't errored once. A HUGE thank you to the people who gave suggestions, they were right on. Thank you all!!