why are we having dead battery so often and only 25,000 miles?

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Car is driven at least 10 miles every day and at least 30 miles in a day twice a week. It is parked in the garage when not in use. we are careful not to leave doors partially open. We have had a dead battery at least 4 times since purchasing the car new. We have replaced the battery once, taken it to the dealers service department each time and only 25,000 miles on the car. Why have a car built for safety when you can't keep it running and feel insecure about even putting it on the road. We had to have the battery jumped two days ago. We then drove the car for about 40 minutes then parked it in the garage. The next morning the battery was dead again. This is just not acceptable.