Q: Fobs replaced with new, but stopped working

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My car’s old fobs broke or cracked so I sent to the dealership. They were able to replace them with a new key and fob and didn’t have to program it since he was able to use the old chips. For a week it worked fine, but then the remote sometimes wouldn’t work consistently. Sometimes the car wouldn’t start without manually activating the door locks a few times. After that the fob remotes completely stopped working. Could it be old batteries, lack of programming, or what do you suggest would solve this problem?

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