I use 5 rx480 8GB with dual mining UBQ and DCR
Before that it was dual mining ETH and DCR.
All run great for few months. Now my GPU0 (with monitor attached) hangs at startup. Any other card I attach monitor hangs on startup every time. Sometimes it can run well for 1h, but after that all hangs. I have lattest drivers, PC recognises all GPUs, everything looks ok. I gave little bit more power to GPU0 because of monitor.
(Wattman settings)
gpu 0: 1050 1000
memory: 2070 1000
fan: 1600 2600 65
power: 85 0
gpu 1 and others: 1050 950
memory: 2100 950
fan: 1600 2600 65
power: 85 0