Really just a shot in the dark, could it be automated course backups not working properly?
Thanks for your response.
All our backups are run over night and have double checked when moodle runs slow that there are no backups or crons currently running.
Hi Tom. Have you added anything extra to your front page that might be slowing it down? ( I worked out your school by the way and I see you do have a busy Moodle front page, although perhaps it worked fine before and you haven't added anything)
we had added some pictures but I have removed them. I think also if it was something like that it would be slow all the time not just random times for a bit. The front page has had this type of design for a while.
It makes me think it is either the antivirus or some sort of process updating etc.