DJM 900 Nexus crash

I'm using a usb 3.0 stick with 2 linked CDJ 2000's connected to a 900 nexus mixer and I've faced the following issue twice playing at the same club:

While mixing a new track in (at a reasonable volume I should add) , mixer levels suddenly go all the way to red. Sounds start cracking and eventually the mixer stops working. After restarting all the devices and trying out multiple ways of playing audio through the mixer I still get no signal whatsoever. Here are the multiple things I tried out:
- Playing vinyl on the phono channels and different inputs.

-Connecting an Aux cable. 

- Using different cables completely and connecting a laptop

and the mixer does not seem to get any external audio signal. I should also add, I've tried disconnecting all the cables (including headphones) going in the mixer and restarting the mixer but still get no signal. The other DJ's who've played at the same place have never faced this issue. I'm clueless to what this might be? Could it be the USB stick that I'm using? I've used the same USB for a long time and have never had any issues with it.

I'd greatly appreciate anyone's help who has a solution to this or has faced the same problem.

Thank you.

K