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My guess is that your bolt doesn't travel far enought to engage the thin plate that runs from the front of the trigger box to the auto-sear. On my recently acquired PDW it does not engage the full-auto all the time, but I noticed that there was an additionnal shim on the valve's rod, blocking the bolt from going completely forward (and thus not engaging the sear)...
You didn't mentionned if it was Open or Closed bolt, this might help...
When it does jam, try to push the forward bolt assist and try firing again after that. If it does fire well, I just explained your issue.
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