Try Intensity 19, if that works you may need to "re-tune" your cards to keep them at I 20.
Thanks I will give that a try... I have 4 different miners... this is the only one that does this.. although others have also been very unstable latetly, Crashing the Scrypt jane miner and requiring a re-boot very frequently !
I had been experimenting with my tuning during and found that I could clock down the memory to 800MHZ from 1500 without a decrease in performance just an FYI for everyone out there ! Also powertune does not increase performance from 0 to +20 does not increase hashing performance.
Cheers,
I have noticed some oddities with tuning on the latest N-Factor as well.
Make sure you're submitting sufficient shares and getting proper WU still. Don't just assume a certain kh/s means everything is good
If the miners are windows based make sure and try CGWatcher, lots of nice features to keep your miners hashing 24x7.