I need help on building a mining rig

I got 6 nvidia 1060 3gb gpus on a ASRock AB350. I can only seem to make 4 work and it crashes often. I run windows 10 64 bit with claymore dual miner. I didnt update bios for motherboard yet. Im not sure if thats causing the problem but its very unstable. I cant mine for more than an hour if im lucky. I tried a lot before coming to the forum because i didnt wanna waste you guys time with my stupid questions but I hope somebody will point me to the right direction because im completely stumped. I also tried a 1 to 4 3.0usb splitter on a 1x16 pci slot and it worked with only 3 connected to it and seemed to be more unstable that way so i stoped using it but i still cant keep it stable even without it. I tried linux because supposedly its much more stable but i have no idea how to use the terminal thing so i went to windows 10. Halp please!