I think there is some validity to OP, as USCIS site states the following :-
"Note: If USCIS is unexpectedly delayed in processing your renewal request, we may provide deferred action and employment authorization for a short period of time until we finish processing your request. We may do this if you filed your request at least 120 days before your current period of deferred action and employment authorization expire."
http://www.uscis.gov/humanitarian/co...enew-your-daca