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Nero pixelating video after writing to disc/file

I have an mp4 file that keeps getting pixelated during some scenes after it's been burned to a Bluray(or written to the hard drive). It's never for very long, but it looks terrible when it happens. The source mp4 is a 1080p file and doesn't have any issue when i play it on my laptop. Anyone know what would cause this to happen? I'm using fully updated Nero 2015. I've tried recoding the file using Nero Recode, but the same thing happens after it's been recoded.
Pixelated Example:
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