The system monitor works fine for 1-minute, then it locks up and won't do anything. I mean nothing, none of the buttons respond. I reboot it, unplug and take the batteries out, it starts up and works fine, then it freezes up again in 1-minute. I have done this 6 times and it still freezes up. I have pressed the reset button and it still does the same thing. It displays fine for 1-minute, then it just locks up.