Rig Mines for a Day Then Freezes?

I have 2 gtx 1070's. The pc has 8gb of RAM. I use teamviewer to check up on the pc and after about a day of mining it becomes inaccessible from teamviewer, shows no video output and the back usb ports provide no power. I've bought a new PSU which didn't help and I'm unsure of what to do next. I am using a pcie 16x to 4 1x splitter, so will try removing that.