Hi dude. Learn how to use Google  Add this to root folder of miner
https://github.com/yalu1O2/ZEC/raw/Path/0.3.4b.zip

Quite possible

Hi dude, you tried to upgrade/downgrade motherboard drives?
Just in case, I will lay out the my current drivers for this motherboard, I have everything working steadily
https://github.com/yalu1O2/MSI/raw/Z170-A-PRO/Z270-A%20PRO.21.20.16.4565.zip
if this does not help, try to up/down gpu drivers. Good luck

Hello.
They turn on and off in the BIOS or utility, i don't know why it was done

I solved this problem by downgrade a bios, i don't like ZOTAC products for such bugs, try dude
https://github.com/yalu1O2/Zotac/raw/ROMs/Zotac.GTX1070.8192.161005.zip

Try a latest chipset drivers, i had same problems

https://mega.nz/#!ag52VYxI!Y7ZbV3vFZmgjZWjOQhiWCM0iBB1grxpmqZXBNHBxKlo

at first do what [YAZ] said, but i think what problem in drivers. I have the same motherboard and with the latest update chipset drivers she did not see 1 of 5 card, roll the driver back to the previous version, if you do not find it - let me know, I'll look for the installer at home