It looks like the miner hangs when switching to devfee mining:
ETH - Total Speed: 402.153 Mh/s, Total Shares: 332, Rejected: 0, Time: 01:06
ETH: GPU0 29.765 Mh/s, GPU1 30.986 Mh/s, GPU2 30.675 Mh/s, GPU3 30.431 Mh/s, GPU4 29.839 Mh/s, GPU5 29.084 Mh/s, GPU6 30.319 Mh/s, GPU7 29.837 Mh/s, GPU8 30.286 Mh/s, GPU9 30.216 Mh/s, GPU10 50.664 Mh/s, GPU11 50.050 Mh/s
GPU0 t=75C fan=100%, GPU1 t=73C fan=100%, GPU2 t=72C fan=100%, GPU3 t=67C fan=100%, GPU4 t=65C fan=59%, GPU5 t=68C fan=61%, GPU6 t=72C fan=100%, GPU7 t=75C fan=100%, GPU8 t=67C fan=44%, GPU9 t=66C fan=31%; GPU10 t=64C fan=40%, GPU11 t=67C fan=45%
ETH: 06/26/18-11:37:34 - SHARE FOUND - (GPU 11) (DIFF: 9.114G)
ETH: Share accepted (109 ms)!
GPU #0: Ellesmere (Radeon RX 580 Series), 4096 MB available, 36 compute units (pci bus 1:0:0)
GPU #1: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 2:0:0)
GPU #2: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 3:0:0)
GPU #3: Ellesmere (Radeon RX 580 Series), 4096 MB available, 36 compute units (pci bus 4:0:0)
GPU #4: Ellesmere (Radeon RX 580 Series), 4096 MB available, 36 compute units (pci bus 5:0:0)
GPU #5: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 7:0:0)
GPU #6: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 8:0:0)
GPU #7: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 9:0:0)
GPU #8: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 10:0:0)
GPU #9: Ellesmere (Radeon RX 580 Series), 8192 MB available, 36 compute units (pci bus 11:0:0)
GPU #10: GeForce GTX 1080 Ti, 11264 MB available, 28 compute units, capability: 6.1 (pci bus 12:0:0)
GPU #11: GeForce GTX 1080 Ti, 11264 MB available, 28 compute units, capability: 6.1 (pci bus 13:0:0)
ETH - Total Speed: 402.169 Mh/s, Total Shares: 333(33+22+30+21+28+23+23+25+21+21+37+49), Rejected: 0(0+0+0+0+0+0+0+0+0+0+0+0), Time: 01:06
ETH: GPU0 29.756 Mh/s, GPU1 30.996 Mh/s, GPU2 30.673 Mh/s, GPU3 30.417 Mh/s, GPU4 29.860 Mh/s, GPU5 29.126 Mh/s, GPU6 30.232 Mh/s, GPU7 30.252 Mh/s, GPU8 30.238 Mh/s, GPU9 30.201 Mh/s, GPU10 50.376 Mh/s, GPU11 50.043 Mh/s
Incorrect ETH shares: none
1 minute average ETH total speed: 402.443 Mh/s
Pool switches: ETH - 0
Current ETH share target: 0x00000000ffb34c02 (diff: 4300MH), epoch 195(2.52GB)
Max ETH share diff found: 97.799T
Current -dcri values: -dcri 8,10,8,18,20,10,8,10,8,12,30,30
GPU0 t=75C fan=100%, GPU1 t=73C fan=100%, GPU2 t=73C fan=100%, GPU3 t=67C fan=100%, GPU4 t=65C fan=59%, GPU5 t=68C fan=61%, GPU6 t=72C fan=100%, GPU7 t=74C fan=100%, GPU8 t=67C fan=44%, GPU9 t=66C fan=31%; GPU10 t=64C fan=40%, GPU11 t=67C fan=45%
ETH: 06/26/18-11:37:55 - SHARE FOUND - (GPU 5) (DIFF: 14.889G)
DevFee: ETH: Stratum - connecting to 'eth-eu.dwarfpool.com' <91.134.50.158> port 8008 (unsecure)
Minimal speed ("-minspeed" option) was set to 370 MH/s. Miner cannot reach this speed for 5 minutes, need to restart miner!
ETH: Connection lost, retry in 5 sec...
GPU #0: Ellesmere (Radeon RX 580 Series), 4096 MB available, 36 compute units (pci bus 1:0:0)
GPU #1: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 2:0:0)
GPU #2: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 3:0:0)
GPU #3: Ellesmere (Radeon RX 580 Series), 4096 MB available, 36 compute units (pci bus 4:0:0)
GPU #4: Ellesmere (Radeon RX 580 Series), 4096 MB available, 36 compute units (pci bus 5:0:0)
GPU #5: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 7:0:0)
GPU #6: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 8:0:0)
GPU #7: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 9:0:0)
GPU #8: Ellesmere (Radeon RX 570 Series), 4096 MB available, 32 compute units (pci bus 10:0:0)
GPU #9: Ellesmere (Radeon RX 580 Series), 8192 MB available, 36 compute units (pci bus 11:0:0)
GPU #10: GeForce GTX 1080 Ti, 11264 MB available, 28 compute units, capability: 6.1 (pci bus 12:0:0)
GPU #11: GeForce GTX 1080 Ti, 11264 MB available, 28 compute units, capability: 6.1 (pci bus 13:0:0)
ETH - Total Speed: 220.363 Mh/s, Total Shares: 334(33+22+30+21+29+25+23+25+22+23+38+50), Rejected: 0(0+0+0+0+0+0+0+0+0+0+0+0), Time: 01:25
ETH: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s, GPU2 0.000 Mh/s, GPU3 0.000 Mh/s, GPU4 29.869 Mh/s, GPU5 29.087 Mh/s, GPU6 0.000 Mh/s, GPU7 0.000 Mh/s, GPU8 30.337 Mh/s, GPU9 30.200 Mh/s, GPU10 50.549 Mh/s, GPU11 50.321 Mh/s
Incorrect ETH shares: none
1 minute average ETH total speed: 220.493 Mh/s
Pool switches: ETH - 0
Max ETH share diff found: 97.799T
Current -dcri values: -dcri 8,10,8,18,20,10,8,10,8,12,30,30
DevFee: ETH: Stratum - Connected (eth-eu.dwarfpool.com:8008) (unsecure)
Any idea how to prevent this?