The only issue I can think of is that the Kobo is simply taking a long time to sync. While most books take 5-10 seconds to sync, occasionally one takes a few minutes. If you sync multiple books at once and it seems to freeze, it might simply be loading one book slowly.
The trouble with reseting the device when this happens is that the database will become partially corrupted; and the device will attempt to re-sync next time you unplug it even if no new books are added.
My advice would be to give the Kobo ten minutes next time it appears to freeze while syncing. I've had mine finally finish after seven minutes on occasion.
Hope this helps
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