Well, I hate to say it, but it seems I can't mine this new CN Heavy algorithm properly. I was using SGMinerGM without much problems getting 4500H/sec out of my 5 AMD RX580's, but now it is horrible. XMR Stak gives me 3300H/sec, SRBminer 3800H/sec, but both miners will crash/get stuck/reboot within two hours. Tuning the miners with intensity etc only make it worse. I can accept the loss in hashrate, but not all these problems.

Same shit with me. I've got 3 rigs, 2 (different cards, but no 580) are working stable, but one with 2x580 and 2x570 stuck/hangs after several hours (but more than two). That sucks.
// gpu: gfx901 memory:3920
// compute units: 64
{ "index" : 0,
"intensity" : 880, "worksize" : 8,
"affine_to_cpu" : false, "strided_index" : false, "mem_chunk" : 2,
"comp_mode" : true
},
// gpu: gfx901 memory:3920
// compute units: 64
{ "index" : 0,
"intensity" : 880, "worksize" : 8,
"affine_to_cpu" : false, "strided_index" : false, "mem_chunk" : 2,
"comp_mode" : true
},