Install a NEW FIRMWARE:
1/ Download the last firmware
2/ Double click F-D4-V1xx.exe it makes a folder "D4update" with a D4__01xx.bin file in.
3/ Copy D4__01xx.bin onto a CF. Insert it in your D4.
4/ Disconnect the network : SETUP MENU --- Network --- Network connection --- OFF
5/ Go to Menu Setup/Firmware version/ choose Update.
5/ After installation: Go to Custom Setting Menu / C / C2 / Standby Timer / Set it to 10 min.