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It's not the key, but the car. Basically you have a transmitter (Key) and a receiver (Car).
In order for the system to work, the receiver in the car has to be listening for the signal from the transmitter (Key).
This means that the receiver has to be on, drawing power, even if the key isn't transmitting.
Over time, this will help run down the car battery (the Alarm and some other circuits remain 'live' too, but can't be cut-off), so Porsche has set the receiver to shut off after 120hrs. (5 days) if the Key transmitter hasn't been used.
To reactivate it, you need to unlock the car manually and start the car. If it's not the battery in the Key (Litium CR 2032 3-volt), or some other issue, this should restore normal operation.
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