it's also lost me a bit, i have icloud but have the allow apps to use it turned off
From what I have seen on mine, it is a memory issue with iOS 5, when the device is running out of RAM it should auto close unused apps, for me this doesnt seem to work very well, so when the device runs out of RAM the kobo app crashes (other apps crash also) causing it to reload the library
the only way I have got mine to not keep crashing (been fine since beginning of the year)
double tap the home button (this shows all apps suspended, using minimal ram and are the ones the OS should close auto if more ram is needed)
press and hold one of them till they wiggle, then hit the minus against them (this fully closes the apps)
closing my apps this way has made my device for all apps much more stable, and very rarely get any issues
check settings->general-about->diagnostic & usage data->diagnostic and usage data
this shows the error reports, if you see a few about low memory this looks like the cause (if you look at them it shows which app crashed)
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