Few days ago I reported on social media (Facebook and Twitter) about a new issue when using certain Lexar 400x and 1000x memory cards with the Nikon D4s camera. Nikon USA has published more details on that issue and how to replaced the faulty cards:
It has been reported that there are a small number of a specific type of Lexar CompactFlash® memory cards that may have a problem communicating with your Nikon D4S DSLR camera. This article describes how to identify the problematic cards and what to do if you have one.
Identification Instructions
a – 8BAFBE
b – 8DCB61
Replacement Instructions
Please contact customer support to place an RMA for a replacement CF® card.