mp4s work intermittently in ipad2 (html5 output)

Hi, I'm hoping someone can help with this issue. On IPad2, some of our embedded mp4s work ok, whereas some don't. They all have exactly the same video settings. Note: On Ipad4th gen, they all work ok.

In order to do some further testing, I pulled the videos from the main project file into a test file and had very strange results. One of the videos that was playing ok in the main project file no longer plays. Whereas one of the videos that wasn't playing in the main project file now plays fine! This is very bizarre and intermittent behaviour that happens for no apparent reason.

Any advice appreciated.

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