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The exact nature of the bug is that some random thing (there are several candidates) running on the kobo keeps a file open and prevents the disk from being unmounted by kobo before it is exported to USB.
The result is that two devices are modifying the disk at the same time which can lead to filesystem corruption.
The most likely file corrupted in this case is the encrypted sqlite file that contains passwords and authentication tokens, which is why your wifi, google drive, etc., stop working.
The most likely thing to keep a file open is the reader itself. Some people say exiting to the home screen helps. (I'm sure it does at least sometimes.) Rebooting makes sure there is nothing else left. I have a NickelMenu entry that forceably turns off wifi and reboots.
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