I've had my 4x8" for about a year, and for the most part it's been trouble free. Went to turn it on yesterday and as soon as I turn the switch on on the control box, it sends a signal to fire the torch. I can press torch on/off button in Mach, but it makes no difference. Rebooted everything, and still torch tries to fire as soon as switch is flipped. Didn't have time to troubleshoot it, will go back later today. Any ideas or things I should check?