I had the syncro (grind) issue in both 5th and 6th. Most of the time it would happen when I would change gears involving a large rpm range change (i.e. 3rd-to-5th or 4th-to-6th). Took it to the dealer and they replaced the tranny under warranty. Haven't had an issue with the new tranny but it only has 5-6k miles on it (although at least 5k of those miles are boosted miles with around 550ft-lbs at the crank).
Just make sure you explain the exact conditions it happens. I had to talk directly to the tech and tell him when I experience it. He drove it around the block and immediately came back and said they were replacing the tranny.
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