I run your miner on HiveOS, mine x16r. 1080 ti, no OC, Power Limit 100%
When I run on 6 GPU, everything is fine. But when running on 12 GPU:
root @ miner8: ~ # uptime
01:26:25 up 36 min, 3 users, load average: 17.54, 15.16, 15.51
what is the version you use of the miner and cuda ?