I have a small farm of 36GPUs (gigabyte windfire & saphire 280x's), been running "ethos" for past year but month by month it has become more and more unstable with cards dropping out,  so 1 or 2 per rig won't mine, and speeds dropped for 280x's from 19mh now down to 13-14mh. Would the hash be higher running claymore in windows on get off ethos?