Sun 20-May-12 09:30 PM | edited Sun 20-May-12 09:31 PM by richardd300
I've had this problem with my D7000 grip, never with the D700 grip! Exactly the same, 3 bars or less, then re-mount and screw back tightly gives 5 bars. It's about oxidation I think and I now use a cotton wool bud with some mentholated spirits and clean the contacts about once every few months and it's not happened again.
I also believe the MB-D10 grip For the my D700 is of a much higher build quality.