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With all the respect to others who have gone to great technical length ... I still feel that the only people who can really say what is wrong are DJI themselves or third party repair services who have the means to connect directly to your machine and do full diagnostics. I do not believe that DJI have programmed for ALL info to be available via dat files and logs that we can look at.
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Nigel
That was also my final point in my previous post, but I don’t think it’s a reason not to figure it out. Additionally, DJI themselves have a mixed history of diagnosing flight problems. I have no doubt that they have the tools and knowledge, but I don’t think they generally use them for individual cases.