The manual says:
The camera turns off immediately even when battery power is full.
The remaining battery power is low even if new batteries are inserted.
•The remaining battery power may not be displayed accurately, and the camera may suddenly stop working, when the type of battery and the settings on [BATTERY TYPE] are not identical. However this is not a malfunction. Depending on the battery
brand and the operating temperature, or if exhausted batteries are used, the remaining battery power may not be displayed accurately.
Use sufficiently charged batteries when using Ni-MH batteries.
You also should set the correct battery type in the setup menu. So put in alkaline / NiMH or oxyride. According to what you are using.
Before you panic, buy a set of alkaline batteries, to make sure your camera is ok. Perhaps you are using rechagable batteries who are not ok anymore.