I've had a Bernina 640 for 3 years. 6 months ago, I got "fatal errors"! Not good! My repair man changed out all of the boards before the problem went away. My machine is still under warranty. 2 days ago I started getting the "fatal error" messages again. The machine just stops until I turn it off and back on again. Anyone else have a Bernina 640 that has had this problem? I sure hope it can be fixed this time! Thank you ~ Nancy