Optiminer 2.0 is great, but unstable af.  

I'm running 6x1060 6GB rig powered by EthOS v1.2.5 (Linux ###### 4.8.17-ethos49 #6 SMP Tue Aug 29 23:24:18 CDT 2017 x86_64 x86_64 x86_64 GNU/Linux), Nvidia driver version: 384.47 
Optiminer 2.0 runs with no errors, the performance is really impressive (equihash96_5), BUT... it works only half an hour max and then HDD led glows red (not blinking), nothing happens, system hanged and unresponsive. So I hit reset, os and the miner loads up... 10-20 minutes and it hangs again...  NO ERRORS, NO NOTHING.. hashrate just drops to zero and then hang occurs. Perhaps my Core2Quad Q9450 cpu is too weak for this miner idk, if so, tell me is there a way to exclude cpu from mining process? Oh and could you please explain --pci-modes there are four, right? which one is best for pcie2.0 system? Thanks in advance.