That must be it, Ryzens always did better than Intel CPUs at Cryptonight.  I'll have to try to mine again with my own to see if they will do better now than they were doing before the fork. You may want to disable Alexis and ccminer-phi temporarily for any algorithms that currently use them as their preferred miners and see if that helps your stability. You could then re-enable each miner for one algorithm at a time and see if that causes any issues before enabling the next. Or if you prefer, you could just disable both miners, especially if their performance is not muc better than the alternatives for the algorithms you are interested in.