Hello all, where I work we have a couple dozen Hobart sanitizes, and recently a couple have randomly given me a shut down in progress message, but wont shut down. They also concurrently display "ready" and wont turn off when the off button is pressed. There's still water in the unit, and the operators claim they're not even initiating a shut down when it happens. It just gets stuck in this situation and the only way i've found to fix it is to unplug the machine. I've tried replacing the main control board also, and the problem still continues. I've also checked grounding and looked for loose wires. Any insight into this problem would be much appreciated.