Console BRICK during show - Hog 4-18 running v3.19 software

I've had the desk freeze in multiple ways, usually curable with Pig+Open+Backspace and a desktop restart.  Barely miss a beat....

This time, last night, partway through the last song  - first time I've had black screens and whatever you see in the attached video. Just went completely bonkers (technical term) and required a power cycle to re-start.  

HPU seemingly continued to maintain the last state, the effects and pixel map media continued to run - is that normal?

Any thoughts?