The camera suddenly turns off.

Check the following:

1. Check whether power-save mode is on: If you do not operate the product for a certain period of time, the camera enters power-save mode. Power-save is released by performing operations such as pressing the shutter button halfway. You can change the length of time before the camera enters power-save mode. For details, refer to the manual.
   NOTE: The setting name may differ depending on the model. For details, refer to the manual.
2. Check the operation environment: For some products, the camera automatically turns off when its temperature becomes extremely high in a hot environment. This is to protect the camera. When using the camera to record long movie clips or shooting many continuous bursts of still pictures, the temperature inside the camera increases. If the temperature of the camera becomes too high, a yellow Image (Overheating warning icon) will appear on the LCD screen. If this happens, turn off the camera and leave it for a while to allow the temperature to go down.
   NOTES: 
   • Any time the camera is on, the internal temperature will increase. This includes when you're actually shooting video or still images, and when not actively using the camera, such as when you're recomposing a shot.
     Note the following points to prevent increasing the inside temperature of the camera.
     • Avoid exposing the camera to direct sunlight as much as possible.
     • Turn off the power when the camera is not in use.
     • For DSLR and SLT models, set SteadyShot to Off.
   • The length of time you allow the camera to cool affects the amount of time you can use it after being turned back on. The longer you allow it to cool, the longer it will take before the internal temperature builds up again. If the camera does not have enough time to cool, the camera will turn off again after a very short period. The cool down time may take a few minutes to one hour depending on the camera and environment.
3. Make sure the battery is sufficiently charged: The battery can cause a sudden power-off of the camera, for example if it is not fully charged. 
   Let the battery charge several hours before inserting it in the camera.
   NOTE: Always use genuine Sony batteries.
   Follow the steps below to check why the rechargeable battery does not charge properly.
   1. Sufficiently charge the battery if it has been over discharged, such at time of purchase or when not charged for a long time.
      NOTE: The battery will gradually discharge over time, even if not used.
   2. Check to see if the terminals of the battery or battery charger are dirty. If the battery terminals are dirty, wipe off the dirt with a dry cloth, cotton swab, or the like. Then charge the battery. Examples of terminals (for NP-BD1):
      
      1. Fingerprints on the terminals
      2. Foreign objects on the terminals
      3. Clean terminals
         NOTE: Be careful not to touch the battery terminals with your hands or metal objects.
   3. Check whether same thing happens with another battery pack. If you have several battery packs, try another battery pack. If the same thing does not happen with another battery pack, there may be a malfunction in the battery pack.

If the issue is still unresolved, the product may need servicing.