G0ROZ-3 vanished from the map again!
A trip up the hill was made today and, once again, the computer was found to be locked up. The power supply to the computer had to be turned off and back on again before the computer would re-boot.
There is a UPS and two spike protector units in line, so perhaps it is not the electricity causing the problem after all.
I will have to find another computer and set it up to run G0ROZ-3 to see if it is the computer itself that is causing the problem.