Server locked up again

For some reason my fileserver/webserver at home locks up every so often. It seems to happen when I am backing up the pc across the network. I do a full backup once a week. The server does not lockup every week. Wonder what is happening. Oh well, will figure it out sometime. Maybe it is time to put everything into it’s new case I have had for over a year. Maybe then there will be enough air flow so it does not heat up as much. Will try to move everything tonight.