From the other thread, it looks many N900's eventually suffer from the dreaded USB port coming loose or totally breaking off problem.

Nokia seem to be replacing the motherboards on faulty handsets to fix this issue, but do these replacement motherboards have any design change to them to avoid it happening again?

From looking at my replacement motherboard it looks exactly the same as the old one, so I fear that the problem will just happen again, but after the warranty has expired!