Battery power problem
Hi Radha. I think you need to put a bit more flesh on the bare bones of information you have given to us. You have not stated whether the batteries are standard AAs or Ni-MH rechargeable. Are they a reputable brand? What is the rating in mAh? Before suspecting a problem with the camera, can you perhaps test the cells with a meter in case one of the set of 4 is failing to hold the charge?
filibuster (Bromsgrove, Worcestershire, UK)