No, it doesn't mean it can't happen, but the only "fault" I've ever personally seen or heard of, is the oil seal slipping down the shaft allowing the 2T to drain into the gearbox!
I would suspect the most likely cause of a failure to be contaminated oil blocking the filter in the bottom of the oil tank, but it's difficult to comment on when failure is so uncommon.
The flow at idle is extremely low. I don't know the figures off-hand (they may be in the manual), but I suspect visually it would appear as if the pump is broken; the feed is that slow.
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Andy.
NSR-WORLD.COM
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