Why do I have a screen wipe-out when writing a lengthy email on Samsung Galaxy S4

When I write a lengthy email on the Standard Email App. I sporadically get a wipe-out or the words "Unfortunately email has stopped" appears. This happens when on both Wifi and Data. All written words disappear.
I have had the settings restored to factory settings, software re-installed and cache cleared.

Unfortunately the typed message does not go into DRAFTS.

Is there a limitation on the number of characters one can write in an email?

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