K20D and battery grip

Whilst I was out earlier on this evening with my K20 and the battery grip I took some photos and after a shot was taken "Battery Depleted" came up on the screen. I was suprised at this as I had charged the batteries two days ago and haven't used them. When I looked at the info setting both batteries were shown to be full.

Anyone else had similar problems?

Regards

Rob

Remove the grip and try the batteries without it, it could be a bad connection, anyway i never use the 2 batteries I only use the battery in the grip so I don't have to remove it, just call me lazy

i get it all the time with the k200d, but have not noticed it with the k20d,