Thanks FullZero..

I currently have
POWERLIMIT="NO" 

POWERLIMIT_WATTS=225

__CORE_OVERCLOCK=0
MEMORY_OVERCLOCK=0

MANUAL_FAN="YES"  

FAN_SPEED=65  #or higher
** However it will go for about 12 to 23 hours and all comes down to 0 sols at which point i have to reboot the system.

If i do as you mentioned Core = 100 and Mem = 900 - it might crash faster - or no?
- i cant find a stable setting, just want this to be auto run.  I have 2 EVGA 1080ti cards running ZEC

Any suggestions?