I have a 4 GPU Vega 64 and 56 rig up and going. When I run 3 card, I can run them just fine without the rig freezing. But when I put more than 3, It mines, but then freezes after 6 hours. What do i do? Is it because I only have 4GB of ram? maybe a power issue? but if it was a power issue, wouldnt it turn off after the first minute of it being on and not go on for 6 hours? Maybe a heat issue? literally have no idea. any help or input would be apprecaited!