Charging system trouble, could be the alternator, ECM, or wiring problems, have the system checked out by someone who knows what they are looking for.
I would definitely look at the alternator. While you are at it clean the battery terminals and cable ends.
I would clean the Battery terminals and cable ends first in case of corrosion. And then if it still happens check your alternator, while you car is running take the ground terminal off the battery. if it continues to run your alternator is OK, if it stops running you have a bad alternator.
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