BTW am using windows
Cdj 400 set up
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Are you using a USB hub to connect the players? If you are, and the hub has a VIA chipset, then that would be expected as they are known to have USB communication issues with Pioneer DJ products.
You may also try a different USB cable and/or port on the computer. Look in your Device Manager to see how many CDJs are detected by the computer.
There new cables. Run straight from the cdj 400 into back of pc not using a hub. Will try again tonight see what's what and also check device manager .
It could also be an issue if you have an Intel SST audio device or an 11th gen Intel CPU. Is that the case?