Ian,
If that's the case why doesn't Yamaha pull all the US ones and distribute the others. Meanwhile check out the questionable units one by one.
This can't be doing their reputation any good.
I've been waiting over a year for the s900 and now I'm thinking of going with another brand, I'm losing faith that Yamaha is willing or able to correct these problems.

The answer is simple stop selling that batch, that container that shipload whatever recall them.