[trefoil]

After some experimentation, I discovered the best solution to the glitches. I can use SCP to copy documents over from my windows laptop via WIFI and then easily view them in Koreader, so Calibre wasn't the only way to send files. The windows interface on the SCP is good enough to make practical. At least now there is no more a need to plug and unplug the kindle just to put a file on it. That was the main goal!