i found a bug in your miner ... https://imgur.com/a/k5Nw9k3 and he still staying like this , i have to go to the rig and reset manually ...
if one of your GPU dead better you restart windows rather than restart only miner.
what is your setting for your 580 to get 34 mh/s? memory type, cclock, mclock ?
Greetings, depending on the model of the GPU rx 580 they have; For example the Sapphire Radeon RX 580 Nitro Plus modified GPU reaches more than 33Mh / s and if it comes with Micron memory could go from 34Mh / s