Unfortunately I only have a Murcie and Gallardo so dont know where the kill switch is. On mine it is in the engine compartment near the battery (which is in the fender well) on the Murcie. The G and Jalpa have the battery in the front. I would find the kill switch and make sure all connections are good and it is not malfunctioning. Also check battery connections and test the battery. Are you using a battery tender? The connector could be grounding out and killing presets. I would find an old analog clock that runs on 12 v dc and see if it loses time between running the car. If you have intermittent power failure, the clock will show it. Make sure and connect to a continuous power source but not directly to the battery. Just make sure the clock stops or resets when the power is killed. Some clocks and radios have a rechargeable internal battery that keeps time when the power is off. I would also check the presets to see if they are being killed as the car is cooling off. There could be a short that is touching when the engine cools off thus killing the radio. Go check the car at 15 mins and 1 hr after shutdown then see if the presets are still good. If not, you probably have a short that occurs during cooldown or the battery voltage drops during cooldown until it kills the presets.Run some tests and let us know. Information is key when chasing electrical problems. Eliminate the obvious first then dig deeper. (Battery, connections, etc)Many batteries now only last a couple of years. A lot of things have threshold voltages to protect them. Once voltage drops below a certain point, it shuts down. It may be dropping when hot after shutdown then recovering enough to start the car. Another possibility is a sticking relay keeping power on to systems that are drawing power until it cuts off the radio. It could be intermittent. Also are you in a salty environment?