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Here's what could possibly be happening.
The 350 is slow. A lot of eBooks these days have high resolution graphics/covers. So, it takes longer to extract the covers to make the thumbnails. When you unplug the 350 from the USB port, it goes through and pulls out the covers from the eBooks and makes thumbnails. I'm not sure if it does it just for the newly loaded eBooks or all of them.
The other option is to get a Kobo Mini which is the same size screen. There is plenty of help with the Mini in the Kobo forum. Also, plenty pf patches to customize it how you want.
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