What is the speed class (the number in the circle) of the SD cards that you are using?
Was the first card filled to capacity when the camera stopped recording video?
The Sandisk speed class 2 & 4 cards will perform kind of erratically, and can just stop working mid-video, because a speed class of 6 is optimal for video no this model. The Lexar 10 is really overkill, but if formatted in the camera, it will give the best, ***** ***** operation.
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