Google has confirmed that the Panda 4.2 update that started rolling out 2.5 months ago is still rolling out.? Google’s Gary Illyes said today that the Panda algorithm, Panda 4.2, that began rolling out around July 18, 2015 is still rolling out.
Don't worry about it - just produce good content that visitors will like to read/watch, and that will keep them on your site.