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When it happens, it's when I leave Calibre open (on my laptop) and I leave it for a while and come back to it. This time when it happened nothing was 'open' other than background things that always are running, such as Thunderbird, CCleaner, Acronis. It doesn't happen consistently enough for me to try keeping them closed. It had happened 3 times in the same day, before I asked original question, and now it's been about a week since upgrading back to current release
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