Hi guys

I've recently started mining and I have been trying to overclock my GPU's (2 x MSI GTX 1060 6gb DDR5 [Samsung]).
When mining with Claymore or any other miner I can see that the hashrates of my GPU's are not always the same and they can drop from 22.5 mh/s to about 19 mh/s at times

Is this something normal as I haven't managed to understand exactly what stability refers to. So far the computer hasn't crashed and i have run the Gpu's for at least a week on those settings

MSI afterburner:

Power: 70
Temp: 70
Core Clock: +110
Mem Clock: +800

Thanks