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Alright, I think I may have figured it out. It's definitely a timing issue. I have both a 5ghz and 2.4ghz wireless in the house and the tab supports both. The 2.4 get's broader coverage and I use it for most of my non-crucial devices and the 5ghz I use for my laptop and heaver media devices.
The ping times to the tab using the 2.4ghz is .150ms or so.. With this I will run into connection issues during transfers but everything else works without issue (streaming movies, etc). The ping times to the tab using 5ghz are in the .075 to .09ms range and with this calibre will work without ever timing out.
A steady stream of pings to the tab during a calibre transfer while connected in either manner shows no missed pings but while connected at 2.4ghz and the slightly higher ping times calibre will eventually disconnect and give me the above errors. Transferring several hundred books over 5ghz I only had one such error and that's when ping times hit 0.155ms.
Perhaps I'm looking at this all wrong but it appears that calibre is being a little too aggressive and should have some wait states if it doesn't make it's connection right away or even some retry attempts?
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