I'd guess something is hogging the cpu, the admins need to look closely at what processes are running,
I wouldn't be surprised to find that the site maintenance is a bit hit and miss, and it's possible that someone has hacked the server, one of my son's servers got hacked last year, and when asked to look at it for him, I found a number of bitcoin miners running, they exploited a known PHP scripting vulnerability, and they also managed to insert a cron-job that re-created the bitcoin miners if they were deleted. No other damage, and the bitcoin miner process names were not immediately suspicious.