Im having an issue when recording video (any bitrate) while in manual video mode. When i first enter manual video mode after startup, i make my adjustments then press the Movie button (large red one on the rear) to begin filming. After 1 minute of filming the screen shows the "recording" message and the filming stops. I press the Movie button again, and the recording resumes, as normal, for the 29.59 min i was expecting. Any ideas?