--Tried the following:
-Restart (duh)
-Disable/re-enable cards
-Driver is good; cards respond to commands from OC tools.
-Cards are good: been mining with them for over a year now.
-Disabled quick-edit mode in cmd defaults
-Ensured program good by Windows Defender and Windows Firewall
-Ensured integrated GFX disabled
-Removing the di command
-Removing gser command
have tried replacing the USB Riser?
have tried mining only one brand that is the same, indeed mixed of the brand on one Rig is a little tricky.
or you can check official thread
claymore