As I put in my rig r9 290 cards a problem appeared. The cards themselves work undisturbed with -100 volts and the miner never restarts. However, every Internet stop crashes the computer. He does not restart - just hangs up and does not work.
rig :
290x
290
290
280x
280x
BTC pro motherboard
Windows 8.1

Even manually if I stop the miner - the computer crashes.
I use Afterburner. When Afterburner starting automatically with windows starting - computer crash on start.
When first start miner and then afterburner - everything is ok .

I have another computer with one R9 290 with Trixxx and situation is the same - internet stop - computer crash.