had the same issue.. didnt like my memory card.. I had used it week before.. then when I tried to turn on the camera it said the card was not formatted and I know there was data on it.. so now today I took the data off that card. put back in d5000 and it said it was not formatted .. I let it format it.. and now interval is off.. I threw in another SD card and its ok.. doesnt like this micro SD card now.. I have another one I have in there now.. but something is strange.. so try another SD card..