It could be a coincidence or could be something your not even thinking about. Microsoft released 4 different updates in August that they are now pulling and telling users to unistall if you downloaded the updates. They updates caused screens/pcs to freeze, not reboot, get hung on certain things and so on.

But if it's not that... I have to ask how many polygons is in the the whole scene? What type of lighting & shadowing are you using. Different light sets makes renders take longer and use more power. Have you considered rendering in layers? Render the house first. Then render Viki next and compiling the two in Photoshop or some other program. Is your Viki current? They have released updates to her earlier this year. Not sure what the updates changed but maybe updating her would help.

My Store & My Freebies