I don't think it's your "tune changing". I think it's something mechanical that's getting worse and re-uploading a bin resets any stored learn trims. Tunes don't just "change on their own", which again leads back to a mechanical issue. The fact that re-uploading the bin isn't fixing it now, is also a good indicator of this.
I've seen this same post so many times and in every case it turned out to be not ECM related.
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