Recently I am getting zombie hashes while I am allowed merged mining script coins + BTC on your pool with some of my old Gridseed sets.
Coincidentally, it gets automatically fixed as soon as I stop mining scripts.
You mine sha-256 at Bitminter and scrypt at another pool at the same time? And then what happens? I'm not familiar with the term zombie hashes.
I think that has more to do with his equipment zombie in my experience your running your equipment too hard. It can't sustain the you settings consider lowering them.