For the 1 millionth time.
NO HASHRATE DOESN'T DROP EVERY NEW DAG. IT ONLY DROPS ON OLD GPUS LIKE 270X / 280X / 7970. [/b][/size][/color]
You are absolutely wrong.
Hashrate is dropping heavily for polaris cards 0.1-0.2 mhs every new epoch. This is stared 2 epochs ago. With epoch 199 you'll get only 17mhs with rx480. Just use --benchmark 199 option of claymore miner.