I have 2025 MK4 Superb for 4 months. Today when I enteres the car and started it, the sound system starts playing awful sounds from the last radio station. Even though I restart the car it continued the problem. How can I reset the sound system?

sounds like your radio is playing at the same time as apple or android car play. I've had this before, usually the first track on the mobile device. look for music app running on mobile device and stop it playing

I had this happen during my last visit to the dealer. They were running diagnostics to fix the massage function (to no avail). The speakers sounded very flat with some noticeable noise. Everything went back to normal the next morning - normal as in Canton's usual low quality.

I don't have the Canton system on my car but my sound system returned to normal after starting the car while leaving work. I asked Gemini what the problem might be and the possible solutions. It suggested me a solution to stop the engine, lock the car and leave it for at least half an hour so that every bus is unenergized. When I started the car after several hours everything was normal on the sound system.