So it is an issue with using claymore miner. it is mining without any issues using optiminer miner for zcash...
Please address issue with claymore miner on zcash.
I have tested both Claymore and Optiminer ZEC miners.
Conclusion and IMHO, Claymore best on Windows, and Optiminer on Linux.
Claymore faster on Windows sure and some say Linux -- but Optiminer is very stable on Linux and smOS.
Currently, RX480, R9-390 and R9-Nano; total 33 rigs are selling Equihash to Nicehash, using Optiminer v1.7 on smOS latest kernel - very stable for weeks now. With smOS and SRR, farm uptime has been excellent.
Best performer for ZEC are the R9 cards. The RX480s are best on ETH but so so on ZEC.