I have been wondering for several months what causes my computer to shut down abruptly and completely, turning itself off. I just found out, though I have no idea why. I hadn't run calibre for a few months, in fact, since summer (wasn't using my Kindle as much) and then began again last week to use it. I started calibre, and as soon as it started doing it's "jobs" the computer shut off completely. I thought that was odd, since I hadn't had it happen since summer. Did it again--shut down. Waited a week, then started calibre again--boom! Has anyone experienced this at all? I have a Samsung R480, and only calibre does this to it! I can't imagine what I might be doing wrong--it didn't do this the first few times I used it. I can't find anything different in the configuration of programs I have installed. Any ideas??
Kathy Weatherford