Hit the keyless entry button two times to have both doors unlock. The car can be programmed to have both doors unlock on one press, or to have only the driver side on the first press and the passenger side on the second. That's how mine is set.
If it used to work, but now requires two unlock presses, your car somehow lost its option programming. Unlocking both doors with one press is a dealer-programmed option, and it appears you're back to the factory defaults. You haven't disconnected your battery recently have you?
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