I think my third one is good...maybe. They all seem to have their individual quirks, but so do most cars in a fleet car pool too.
Does seem to be some QC issues along the way with DJI. But if so, steep discounting with the possible RMA matter to fix them doesn't seem economical overall. Unless those refurbs go out to the unknowing along with a lesser day warranty like Nikon does with their refurbs (90 day on their online store refurbs verses 1 year on new.). I know about the Nikon refurb issues as I got a bum one that I figured out after 90 days and maybe why it went back (SB-900 flash overheating issue.). Never again!
I did find the exchange process very easy with my local Best Buy. Just take it back in all boxed up and say, "Give me another one of these critters to debug, 'cause this one does _____."
Mack