I have a queer situation... I used to be able to fill up my Lexar 1GB (4X) card shooting in JPEG. Recently I found the fun of using RAW, and start using it. The problem then starts: after shooting about 50+ RAW pictures my camera would start hanging: first the focusing ring would start zooming out and in, the camera system hangs, the card stop writing... and wham: error 02. Any suggestion?