Fran,
I have had my s950 for over a month - used it on about 8 gigs with absolutely now problems at all. The S950s with the problem were shipped 6 months ago to None USA places and they have been recalled and replaced by Yamaha. The S950s shipped to the US were shipped with v1.02. The v1.03 has been available now for over 4 months in Europe.

And yes Fran the auto fill can be turned off as Ian said.
Deane