most likely the fast charger supplies a "dirty" voltage or RF interference which messes up other things within the device , like touch screen detection and thus causes the freeze.
I have seen those "dirty" effects on windows laptops where using a cheap generic charger severely messes with touch pad controls - but only while charger is operating.
its it not really fair to blame Kobo for side effects that are not present with a Kobo approved charger.
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