I have 6 Sapphire rx480, and a XFX rx480 also. This is the setup in my .bat file:

setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100

EthDcrMiner64.exe -epool eth-us-east1.nanopool.org:9999 -ewal 0xc4b662640404c3e32463ae44eb28f178b129f74e/CYC -epsw x -dpool pasc-us-east1.nanopool.org:15555 -dwal 86646-64.4e219f21e2515fc4/CYC -epsw x -dcoin pasc -dcri 15 -mode 0 -esm 0 -etha 0 -ethi 8 -eres 2 -erate 1 -estale 1 -dbg 1 -tstop 80 -gser 2 -mport 0 -fanmin 70 -fanmax 85

My screen goes all black randomly, and last time I checked, I got a blue screen error. What it could be?