Hi guys. I bought a brand new AEG CIB6740ACB today fitted it and cooked all ok. Loved it. But the cooling fan seems to be on non stop after cooking. After a hour I decided to open the oven and grill door to help it cool down. So do I have to do that every time? Or just the grill door open as I noticed there was cold air blowing out from it? Or have I got a faulty one and have to return it/fix it under warranty?