Try a larger virtual memory. I was having that problem on my 1050ti's and increased the size and it seems to have helped so far. I do however see it pop back up after about a day though.
I got to say that is pretty slick! I wish I saw this before building my recent rig as I'm too broke to build another one right now. I wish you guys success!
Do you have the two molex connectors and the one SATA power connector on the MB hooked up? Also, make sure that you are splitting the power equally with your power supplies. Having poor power from a crappy power supply can cause stability issues. I had some problems with mine until I had two good PSU's that provided stable power.