so as recommended in a previous multicam issue/post - did a reset of the program,

...and then added the transitions (75) to the clip as you can see in the attached pic

- the same - works fine in the multicam editor, but when you click OK and leave the multicam editor and the file is in either your project bin or timeline, same problem persists.... with frozen video in sections and no audio - all occurring after that 36 or so minute point...makes me wonder why it stopped at that point - it's not at the end of a clip or any other point - just stopped there before 'finishing' the render/coding or whatever it does of the multicam