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