This morning, I performed a cold start, and a Start-Stop system error appeared immediately (though the Check Engine Light / MIL remained off). After a 15-minute drive, I stopped at a gas station to refuel. The vehicle was stationary for about 5 minutes. Upon restarting, I drove 10 meters to the main road and stopped; the Start-Stop system engaged correctly, and the engine stalled/shut down as intended. After another 10 minutes of driving, I stopped in a traffic queue, but the engine failed to shut down. I checked the vehicle status menu, which displayed a Start-Stop error. Five minutes later, I cycled the ignition (turned the car off and on) about 100 meters before my destination. The start-stop error cleared, and upon reaching the parking spot, the engine shut down automatically. After the car sat for 5 hours, I took a short trip (under 5 mins), and the Start-Stop error reappeared instantly. Following a 30-minute soak time, the error persisted on the return trip. Again, I cycled the ignition shortly before parking; the system reset, and the engine shut down normally at the destination. Scanning the vehicle with OBD11 revealed the old P25AB00 Piston Cooling Oil Control Circuit High. Toward the end of the day, the Check Engine Light (CEL) illuminated, and the Start-Stop system became permanently disabled. The service center is currently in contact with Škoda’s technical support for consultation. They are awaiting a response. They've also double-checked the bypass and used a cleaner spray on the contacts. Interestingly, the fault did not reappear at the service center after they inspected the car, cleared the codes, and performed a 40 km test drive with over 20 ignition cycles. During their testing, the car reached full operating temperature. In contrast, when I'm driving, the error occurs very quickly—usually after just a few trips. Will report back :)