Same old problems with the z990 even though I purchased a 10 speed SD card--VERY SLOW. It seems that the batteries drain quickly and that slows down the camera.
The number of pictures stored on the SD card seems to matter more than the charge level of the batteries. If the Kodak batteries drain too quickly, try Eneloop XXX.
Reality is that which, when you stop believing in it, does not go away.
Kodak DX7590, Z980, P880, C875, P850, M583, P712
( Lumix TZ5, my wife)