Common denominator seems to be the car. Resting battery voltage seems fine. Both the unpowered RFID function (car start) as well as the powered RF (door open) stop working at about the same time. Batteries in key are new also (even though that would have no affect on the car starting function). Have another key and it doesn't work either. Is there a central computer to blame?

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra