I've had similar bugs and crashes as well @tahitibub. The take-away from this is that even though running Calibre is the only time software triggers the panic or crash, it isn't considered something Calibre is able to do. My manifestations of this a couple of years ago were centered around a USB 3 PCI-Express card and the open source XHCI kernel extension that talked to it. It was wicked frustrating and never resolved until I switched hardware. (Bought a different USB 3 HBA that could use Apple's extension and driver.)
I bet if you bought Apple's USB ethernet adapter like the one they used to ship with the MacBook Air core 2 it would be fine!
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