Sorry to hear you're having trouble with Calibre and Koreader. This error usually occurs when the connection between the devices is unstable or slow. Here are a few things you might try:
1. Ensure both your Kindle and the device running Calibre are connected to the same network. Connection issues often arise from network discrepancies.
2. Restart both devices. This can help clear up minor software glitches that could be causing the problem.
3. Update both Calibre and Koreader to their latest versions if you haven't done so already.
If none of these steps work, it might be worth checking out the Calibre and Koreader forums for similar issues and potential solutions.
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