The CKEditor instance always unloads if an AJAX request is sent from the page it is part of. This happens for example if having a Drupal Core Image field widget on the same node creation form and clicking "Upload" there (even without an image selected) or "Remove" after having one uploaded.
The correct behavior is that CKEditor would unload only if the DOM element hosting the CKEditor is unloaded (see Drupal.detachBehaviors). It always unloads because the trigger parameter of Drupal.detachBehaviors is not transmitted all the way to Drupal.editors.ckeditor.detach() in editor/modules/editor_ckeditor/js/ckeditor.js:23, so the detach() function will always react as if trigger == "unload" and destroy the CKEditor instance.
Fixed
1.0
Code
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Issue #2691101 by tanius: CKEditor unloads on every AJAX submit due to...
Automatically closed - issue fixed for 2 weeks with no activity.