Your issue may be brought on by batteries that are weak or worn out, or by corrosion on the battery contacts inside the camera, which can stop the full power of the batteries from getting to the camera. Before you do anything else, try this free solution: After removing the batteries, thoroughly clean the camera contacts with a dry cloth (severe corrosion may call for the use of a wire brush, steel wool, or sandpaper). Clean both ends of the batteries, then reinstall them in the camera after clearing out any residue that may have gotten into the battery compartment during cleaning.
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