The camera setting may be lost if the battery is removed from the camera immediately after the camera has been turned off. It takes approximately 5-10 seconds for the settings to save after powering off the camera. To avoid losing your settings, wait at least 10 seconds before removing the battery after turning off the camera.
NOTE: The camera stays in standby mode for about 5 to 10 seconds after the power is turned off so that the camera can be started quickly when it is turned on again. The camera saves the settings after that period of time.