This past weekend, my M9 kept locking up right after taking a shot and presumably during card writeup. After taking a shot, it would just lock up. The red light that shows powering up/writing to card wasn't blinking though. None of the buttons would work. I removed the battery and put it back in. When I turned it back on, the red light did blink. All the functions and buttons worked properly, except for the playback button. As soon as I hit the playback button, the M9 would freeze again, and all buttons became non responsive again. The process was repeatable -- take battery out and put it back in; turn back on; all buttons work until I hit play. If I tried to take a photo, the camera also froze right after the shutter press. So some moments later, after repeating the process, the camera starts working again. I'm able to see the photos when pushing playback. I am able to take more photos. BUT, then same thing happens again. I was using an 8 gig SansDisk Ultra Extreme Pro SD card with 45mps speed. So I switched to a PNY card that was a little slower. Everything worked fine again. But then, I had the same lock up again ... Repeated the taking out the battery process, blah blah blah. Then camera worked fine again. Got home, downloaded the photos of the PNY card into iMac. All photos there. No problem. Put the SansDisk card in the iMac, and iMac didn't even recognize the existence of the card. Put it in the PC desktop, the PC saw the drive "E", but when I clicked on it, it would try to read, and then eventually give up trying to read the SansDisk card. This isn't a situation where there's an empty folder or an empty card. My computers can't even read the card. Any ideas on how to rescue the DNG files from the SansDisk SD card?? HELP!!!!