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I've had similar when batteries died during a shoot, card was halfway through writing at the time. I had to salvage the card , slow format on pc and integrity check to make sure it wasnt a damaged card, then format in camera and fine ever since. Suggestion: rotate in good full batteries during a shoot, don't push the limits and tempt fate. Only lost the shot it was writing at the time. This was a photography shoot btw, not astro where lowering temps increase risk of battery failure so more important to swap in good batteries for safety.
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