I’ve been mining with 99 GTX 1060’s for just over a month. I’m using Nanopool which displayed an estimated return of between 11 and 12 Zcash per month. Last Monday the average has lowered to between 8 and 9.5 Zcash per month.
The Sol/s are still in the same region.
Any idea why there would be a sudden drop in estimated returns?