When I create a mix is ok, but after about or 10 minutes the speed is suddenly very slow and I can't do anything to correct it to the right speed.When I create a mix is ok, but after about or 10 minutes the speed is suddenly very slow and I can't do anything to correct it to the right speed. When I create a mix is ok, but after about or 10 minutes the speed is suddenly very slow and I can't do anything to correct it to the right speed. I can only close the software and start it again and then it's good again, but bene not for long. Can someone tell me what it is? Thank you