M1ABD went off air at around 1130 Hours yesterday, 18 May. I was unable to get to site until today and M1ABD was back on air at around 1630 Hours.
The computer was switched off again, although there was power and everything else was running normally. Tests showed that if the power was cut off to the computer it would not switch itself back on again when the power was restored. So, there must have been a power cut yesterday and the computer turned off until I turned it back on today.
This never used to happen as the computer had always come back to life on its own when the power came back. Will have to look further into this and, probably, get a new computer installed on site.