Ahh, I don't know why.. but I am going to reboot my 7 S9's. I did that before, and then the pool found a block.. I Know... its useless step, but I have a hunch...
Some have been up for 29 days.
I will sacrifice my .00001% of shares for this... then you will see a block will be busted!
I rebooted mine earlier today for the same reason!