Did something happen that hit CUDA mining particularly hard that last DAG change? The hashrate on the MSI GTX 1070 GAMING X in my gaming rig dropped almost 2Mh/s but the RX 480s were unaffected.

I have an issue with my 1070 Gaming X too.
Hashrate seems to remain the same, but effective hashrate is much lower.
There was no changes for my 1060s whatsoever.
I'm still plagued though with whatever it is (see below) on workers with 8*amd and some Nvidia
21:22:19:597 117c CUDA error - cannot allocate big buffer for DAG. Check readme.txt for possible solutions.
21:22:20:299 7ec GPU 9, GpuMiner cu_kd failed 30 (4), unknown error
21:22:20:299 7ec GPU 9, Calc DAG failed!
21:22:20:424 7ac GPU 10, GpuMiner cu_kd failed 30 (4), unknown error
21:22:20:440 f48 NVML: cannot get current temperature, error 999 (an internal driver error occurred)
21:22:20:440 f48 NVML: cannot get fan speed, error 999 (an internal driver error occurred)