Hi

I had some similar issues with my screen going blank from time to time, but mine was like every 24H
What helped me was, using the 13.12 drivers, but I did not install the AMD/ATI Catalyst software, I just installed the drivers by selecting my windows device manager and finding my display adapter and updating the drivers and selected my drivers manually.

I still have some crashes from time to time, but not as frequent as before.

I'm still a noob at mining, but finding out how to fix my problems as I go along.