Twice in the last couple of weeks my Cortex PC has fallen over. The defibrillator has done its work and rebooted the PC, but Cortex has come back using an old house plan.

I only noticed when a couple of things in the house haven't worked, and the house plan was flashing away saying nodes weren't responding, (because I had changed them on the up to date plan).

Any ideas what might be going wrong?