I have been running Sapphire Pulse RX570 4G and RX580 8G GPU's for the past year using the Claymore dual miner (Win10 Pro) w/o any issues until a few days ago. Same problem on 4 different rigs. Any help will be much appreciated.
https://imgur.com/3Wt4AszPerhaps try rolling back recent Windows updates.
https://www.thewindowsclub.com/rollback-uninstall-windows-10-creators-updateAlternatively, DDU your AMD drivers and install the most recent Adrenaline driver. Consider uninstalling and reinstalling Afterburner to the most recent version as well.
It's strange that your hash rates are so low though.
Best of luck!
I'm using older version of the Claymore Miner - you think that could the cause for sudden hasharate drop??