I'm trying out double slot recording (A and B slots) to protect against card errors. I have cards in the A and B slots, switch the camera to "double slot recording - ON", then hit record. When I tried to end recording, the camera is unresponsive, even when turning the camera on/off dial the camera is unresponsive. The only thing I can do is pull the battery to restart the camera. This happened each time I tried dual slot. I tried a few different cards with the same result (SanDisk 128's). I'm shooting 12bit RGB 444. Any ideas??