We are currently experiencing a strange problem where our Moodle server is crashing over the weekend. This has been happening for the last few weeks and only happens on a Saturday afternoon / evening but never at the same time. I've checked the Moodle logs and there is nothing out of the ordinary happening just general usage and I've checked the server logs and nothing shows up there, the box just seems to freeze.
At the moment we are looking into the possibility that this is being caused by the main server backups that run from a friday evening till Monday morning but our backup expert does not believe this to be the cause and has checked the backup logs. We are at a loss to work out why this is happening and at the moment the server guys think it could be the application whereas I am convinced it's got to be a server issue.
Has anybody come across anything similar or can offer any suggestions or things to test / look at?