I currently use a American audio MXR19 with virtual DJ Pro 7.4.1, I am having problems that starting last week where the gain and volume levels just drop unexpectedly on deck A. Player B Won't function at all. It's as if it is frozen. I had to use player A in auto mix to get through the evening except the gain and levels kept dropping every couple of songs and sometimes the volume would go out completely for 10 seconds. This has happened all of a sudden and prior to this, I've had no problems at all. It has worked exceptionally well. I tried changing the USB cable thinking it might be shorting out but it still does it with a new cord. Has anyone else experienced this problem.