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I am listing this tip for the Nikon Coolpix 995, but the tip is valid for all Nikon Coolpix models.
The Nikon cool pix settings are saved into an internal memory.
The internal memory is maintained by an internal rechargeable battery, that is recharged from the main Li-Ion battery. If you leave your Nikon overnight with no main battery, or if the Li-Ion batteries have drained, then the internal battery will also drain , resetting the clock and other settings, saved on the internal memory. The camera may even drain in about 6 hours depending on the camera, normally it takes at least 12 hrs to drain the clock battery. If the internal battery is resetting immediately, after you set the clock, or just after few minutes, then the clock battery must be replaced. The camera must be disassembled completely to replace the battery located on one of the two main internal boards.
Nikon says that the clock battery loosing charge is normal. I quote what they say on the publication titled " The Nikon Guide to digital photography with Coolpix" "…Backup battery of the clock The clock-calendar is powered by a separate rechargeable battery, which is charged as necessary when the main battery is installed. If the camera has been stored with the main battery removed for a long period of time, the clock may need to be reset. Once the main battery has been reinserted, the clock battery will recharge in several hours, during which time the main battery should be left in the camera."Original file: Download here If the clock does not work at all, and is resetting immediately, even though the Li-Ion batteries are fully charged, then the best thing to do is calling Nikon, at the number listed on the owners manual, telling them that you did not do any improper use of the camera, and trying to get the fault repaired as factory defect. That is not always possible, and the decision depends on Nikon customer service. See also: Nikon | Contacts Ginko.
It sounds like the file is corrupted. Try formatting the memory card in the camera. This will wipe the memory card clean and eliminate it from the being the problem. Formatting the memory is erase the memory card and you willnot be able to get the pictures off it after you format it, so make sure you down load all you the pictures you want befor formatting the card. Then occasionallly after downloading everything, format the card on a regular basis. This will help to keep the cards internal memeory from being fragmented. If formatting does not fix the problem, try another card (format it before use) if this does not fix it, take it to a local camera store and let them trouble shoot the problem or send the camera off for repair.