I have 2 GPU HD7970 on Windows 7 64 bit, all works fine until I use teamviewer for remote connection, the AMD driver (Crimson 15.12) stop to work and from GPU-Z and MSI Afterburner I can not see any GPU infos. I have try to reinstall the AMD driver but the problem is still present.
The monitor is not connected to the Computer.
I had lower hash rates and and driver crashing when I started the miner while connected in using teamviewer. The fix I found was adding a shortcut to the start.bat file into windows startup folder. Stable for over 600 hours.
So on every boot the miner will launch. I also made the windows user auto login, and added this line to the .bat file:
timeout /t 30 /nobreak
That line gives a 30 second delay before the .bat file executes the next command in the file.