The problem is this. Windows 7, 4Gb, 30GB swap, 5 GTX 1070 Palit super cards. Nvidia drivers are the latest. MSI Afterburner is the last. For 2 years everything worked well 32MH from the card. After changing the ETH era to 315, all cards began to show 23MH. In one rig there are 2 RX 580 and 3 GTX 1070, a 580 hash rate drop was not noticed 32MH remained, and 1070 23MH. 1660Ti is also no problem 30MH. 1060 6gb hash drop from 25MH to 22MH. Something happened at Claymore with a series of 10 Nvidia. I switched to ETHMiner 0.18.0, 1070 show 31MH. What is the problem?
What version of Claymore's miner are you using? You should be on 15 and that won't be an issue. None of my 1070s are running lower than 29MH/s. Using Claymore version 15.