Thanks for the replies. Since the error was occurring on my custom app, but also on the two Oxford built-in dictionaries, I've been assuming it was not due to my app.
I've made scores of changes to the app since originally posting this "help." Don't know if any of those content changes could have corrected the problem. Anyway, it isn't failing anymore (at least this week), so all is well.
Perhaps there was an error in my app which was hosing the Kindle O/S and subsequently causing it to fail with the Oxfords. Of course I tried a hard boot and that didn't solve the problem at that time. One of life's mysteries.
Thanks again for all the good suggestions.
Ralph
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