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What are the source files in this (and the other offending) Project? Do they match those Sequence/Project Presets?
Does the Audio in these source files differ in any way?
What is different about this/these Project(s), from the others?
Often, Encoding will fail because of gaps in the Video. However, the error message is usually "Failure to Return Frame."
I figured this problem out eventually, or at least I figured out a reasonable solution to it. It turns out there are a few frames in the source files that, when rendered, cause a failure. I'm not exactly sure what is in these frames that causes the rendering to croak, but through a divide and conquer process I was able to splice over the failing frames and do a cross dissolve between the two segments.
While not perfect, this at least allows me to render the videos.
Glad that you got it sorted, and thank you for reporting that success!