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It could be the batteries getting weak, I'm not sure what the mechanism is for the FOBs (if they constantly send a signal to the car for the push button start, or if it's an RFID style reading where the FOB doesn't need power to start the car, the car can read it remotely.)
Assuming it needs power to start the car, could be your batteries are going and limiting the effective range of the FOB. Also, since I don't imagine you used your spare often, could be it died long ago(a week, month, or more), and you just didn't know because you didn't try to use it until your other one died. So it's not necessarily that they both died at once, could just be bad luck with which died first.
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