Well, I got home tonight and was setting up for another carve and it did it again while I was jogging the router around. Y lockes up mid stroke and “cries” until the joy pad is let go of.
The wires are as they were last night when I finished the carve, nothing was powered on besides the controller. It seems to be happening more frequently as well.
EMI may have played some part in this but there are deeper issues at play. I have reached out to tech support again.