Same problem. 6x1070 works fine until ~600th share (about 8-10 minutes), then many rejects and miner stucks without any error message, nicehash solrate going down, but gpus still "working" & draws power. Win10 1607, stock gpu/mem
running eqm with only up to 5 gpus works fine, adding the 6th card breaks it however, maybe devs can fix it with this info
cheers
edit:
EDIT
running split 2 bat (cd 0 1 2 and cd 3 4 5) still breaking
this works for me
edit2: strangely it works for me now on my 6x1060 rig even with 2x eqm.exe with cd 0 1 2 3 4 5, the eqm.exe on my 6x1070 rig is still crashing however