I had similar problem running 6x 1050ti Zotac LP (they are actually very good cards). The solution (for me) was to update the Win 10, get Claymore v.11 and play a bit with the memory. Right now they are running for 48 hours at ~51 grad C / 70% power/ +600 memory at ~14.5Mh/s (85 Mh/s for the whole rig) at miningpoolhub.