The issue is that the card takes too long to add the dag file to the memory. Normally, dag is created in about 10.000ms (about 10 seconds), 7 seconds most part of the time. But since dag 350, my 2 RX 580 4gb need about 70 seconds. Since watchdog reinitialises the miner at 60 seconds, the cards stay offline all the time and the miners stop working.
The work-around is to disable Watchdog or add more time to reiniciate the mining rig after a GPU fails as it's detected by WD.
Pretty good, thanks.
At least the dag is being processed. Usually miners leave the pc without a single restart for days. Well, as far as I can tell and I don't use watchdog at all, the rx 470 worked without any problems and it did not take long to start mining. All I saw was a normal behaviour. If dag 350 is causing issues for some people, imagine what will happen in a week or so with dag 351.
I guess to some people will be a good time to think about moving 4gb cards to something else.