The real problem?
055166k
What are you talking about?
a) 'the computer' doesn't get shut down 2-3 times a week.
b) 'the computer' gets 'shut down' once a week AT WEST DRAYTON. Even then, it's not shut down. Just not available to the ATC system.
c) Swanwick computers get updated every airac cycle, requiring the centre to be disconnected from NAS approx once a month.