Regulations were applied to the sectors concerned as staff were moved to other sectors, to alleiviate worse delays. All comes down to staff shortages i'm afraid. You may have noticed the pattern of pretty horrendous delays over the past 10 days. About 65% of these have been down to staff shortages. As for a computer problem, there wasn't one that i'm aware of, but hey it makes life so much easier to blame the system just as it is to blame ATC