Stale shares on ethermine.org

[marinko9]

Hello,

How many stale shares do you get mining on ethermine.org? I have noticed that at the moment I have 6% of the shares under stale which seems too much to me.

[RieraMusic]

 I have the same problem on nanopool mining ETN, the weird thing is that I only getting this problem in 1 of my 2 rigs. I was mining ETH before without any Stale share, NEVER. Now mining ETN I get stale shares on 1 rig , im very confused, the rig seems to work very fine. I would like to know too what would be causing this problem.