On one GPU I get a rejected DCR share every 5 minutes or so, but ETH shares are coming in just fine. It says "Did you overclock it too much?". I don't feel it's worth to downclock the GPU to get rid of the incorrect DCR shares, since I would lose ETH speed too, but I haven't calculated if it really would matter.
My hashrate for this GPU are 29.8 Mh/s ETH and 715 Mh/s on a Sapphire Nitro+ RX 570 (Micron). Another identical card with the same settings work fine and has no rejected shares. It just annoys me a little reading the logs for that card.
Another option would be to disable dual mining on that GPU, and get a little more ETH hash rate. But I don't know if I can see a total of how many shares it found, but in the logs I see that it finds both ETH and DCR shares continuously..
Did anyone else have a similar issue?