well here i am in december 1999 having only just discovered this site.
as an amateur player i wondered why on occasion my keyboard would freeze up.
I bought it brand new here in Plymouth UK as a family Xmas pressie in december 1997 and am generally v.pleased, still especially having discovered style sites.

I am annoyed that from what I have read through the posts I seem to have an early ROM and I was never contacted by any service agent about upgrade. Am I too late ??? What do I have to do??

May be you are late cause now yamaha has started shipping PSR640/740. But you may contact them or any local dealer for a solution. By the way what ROM bugs you are facing ??