Why did battery die in new 2017 w/ 4K miles?

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Had to jump car 3 times. Battery cell dead. they updated the software on the alternator so battery could charge more efficiently. Subaru dealer said this has been a common problem. Would have been nice if they informed us rather than this occurrence disrupt a trip far from home and a dealership. Now, cannot control passenger window and dash read out info is gone. Taking it back in.