In simplified terms, Airbus has been analyzing the A320 NEO and discovered under analysis and testing of the NEO flight control laws there are conditions a pilot can experience increased pitch. Temporary revisions to the A320new flight manual have been made to address the situation. Changes in the CG envelope and loading recommendations. Both the Leap-1A and P&W versions are affeted. EASA has opted for a quick implementation of an AD requireing the changes within 30 days of 14 August. They follow the problem found on the A321neo elevator and aileron computer which affected AOA protection. Airbus is working on a software fix for the A321new to become available next year.
Like the MAX but no fatal crashes yet.