Hmmm... The error message says that something on your calibre computer cut the connection. I wonder if a "threat detector" in your AV or firewall is being triggered by the traffic. The CC/calibre connection sequence is a bit unusual, consisting of UDP broadcasts followed by a TCP connection. A rapid series of this sequence could be considered suspicious.
If you are running some kind of firewall on your device then it could be doing the same thing.
I realize I am grasping at straws, but I don't have any other ideas.
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