I am slowly trying to build a multi GPU ETH/DEC mining rig. I have my second RX 480 card in it and after adding the second card I get an OPEN CL hang error and one of the GPU idles down to a memory clock of 300 MHz and stops mining. I have added the flag and bat file for an automatic reboot but I would prefer to have this not happen at all. I downgraded drivers and it happens less often but it still happens. I set virtual memory to 24000MB. What types of things will cause this to happen and how can I prevent it in the future?