No idea what the people who have problems do different, but both ZEC miners (Opti and CM) are running stable. I can not really remember when one of these miners crashed (with quite some overclock and on more than a few rigs/GPUs). ETH (especially dual) and XMR are another story, at least for me. And I am talking about Windows...
I have 2 rigs with no overclocks, on both I get 1 card hanging on optiminer. Nice to get almost almost 350 sols more, but I don't need to check if CM 11.1 give problems, I know it's OK. With only 9 cards running I can't afford to leave cards hanging, so opti not working for me and I'm not the only one with this issue. Will use it if miner can run all my cards for days not hours.
