Yes, I experienced exactly the same thing. Outside temperature 16 degrees Celsius, average speed maximum 80 km/h, driving time 30 minutes. Afterwards, I stopped in a car park. The fan was running at full speed and was extremely loud. It drowned out the engine. After about 5-10 minutes, no change. I drove on. Same parameters, stopped again. The fan runs very pleasantly quiet, as I expect. I will observe this on the next few rides. It will be interesting to see what it does at high outside temperatures.