Maybe just coincidence? You never know until you try it again. What version of KProbe are you using? I downloaded the new 2.4.3, was looking what has been changed, checked the part where you can see all the technical details of the drive and there it shut down. I tried again, same thing happened. Fortunatelly I still had 2.4.2, so installed that one again, and all functions are back to normal again. It could be there's something faulty with the newest version.