Sigh. Apple really, really dont want you to use any third party software do they.
How on earth is clearing the cache without even asking the user a security feature?
You can probably work around it by re-downloading the book when the cache is cleared, assuming you have an available internet connection.
Or you can try using Chrome on iOS which may or may not be subject to this "security feature". Although since Apple disallows any third party browsers on iOS which means that Chrome is really just a wrapper around Safari, probably it suffers from this "feature" as well.
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