Anyone here mining ZenCash or ZClassic ??

I have little problem with those two every hour or so valid shares go blank estimates go blank too like you dont mine but my miner is up and running and mining normal and hashrate on the pool got stuck i dont think i'm getting anything when this happens and it happens a lot
When this happens a lot in a day i get 6,7 times less when its not happening like one day i make 1.75 zen and the next day when starts to happen often again i get only 0.28
a bit lower dont you think
 so anyone got a problem with those two