Strange problem with one of my rigs:

One of my rigs after 3 months of good works now happend strange things: system cannot boot, hangs, errors like

- AMD Page Fault:
http://netstudio.net.pl/images/smos/AMD_page_Fault.jpg

- AMD-Vi:
http://netstudio.net.pl/images/smos/AMD-Vi.jpg
- and others like network problem

http://netstudio.net.pl/images/smos/failed.jpg

Hrdware is ok, Win10, Linux (Ubuntu, Knoppix) works on it fine, network card is ok. Old version simpleminer-RX-v1118-kernel4.11-16.60-noae[Suspicious link removed]g doesn't boot or resseting rig after miner start, new version the same. I've tried different pendrives, burining soft, RAMs. The same problem is with one GPU, two ... eight I have. Mainboard is Gigabyte GA-970A-UD3P, AMD FX-8300 3.1GHz, 2x8GB DDR3 Kingston
GPU: XFS RX 480 x1, Sapphire Nitro+SE RX580, Sapphire Nitro+ x1 RX480 x 2

Yestedrday this rig works fine, any problem, about 28-29Mh/s per GPU on old version smos.
Other rigs with new SMOS works fine on older mainboard and with 8xGPU

Any ideas?