Check you virtual memory settings. Usually dk2a error is assosiated with low virtual memory. Set more then combined all GPU memory/
I had a 17000MB Virtual Memory and I increased it to 20480MB but it didn't help . Any other ideas what I could try?
Oh.. And I updated drivers to 17.11.4. That didn't help either.
I'll remove RX480 from your system, deinstall current driver with latest DDU and install august blockchain drivers.
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I managed to fix it. I had to put line "-dmem 0" to config file because otherwise it used too much memory in 280 (over 3100MB and 280 have only 3072MB).