Nikon Investigating Issue of D4 and D800 DSLRs Locking Up During Usage; Offers Temporary Fix
The company stressed, however, that the issue seems to have affected
only a "small number of D4/D800 users" and that there is a temporary fix
to the problem if it does occur. The fix requires the user to turn off
both the Highlights and RGB Histogram on the display though Nikon did
not explain why these features might be causing the problem.