I've noticed that calibre has a habit of crashing when it unexpectedly loses a device connection. Today I plugged in my phone, copied some music files to it, and then "ejected" (this was on Windows). Nothing to do with calibre but it happened to be running. As soon as I ejected, calibre crashed. I'm not sure, but I think this was the first time calibre had seen the device.
Using the tip above, I've added the device to the "ignore" list.
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