Have you let the miner sit for a few minutes after starting it?  For some reason, my rig takes about 1-2 min to start mining after listing pool info.  I've done clean reinstall of windows 1803 and drivers and Claymore 11.7.  I'm about to start pulling cards one by one to see if its an issue with the card.  I noticed this behavior with the new 18.4.1 driver and 18.3.4 driver.  I'm going to keep going backwards in driver version to see it this stops as well.  I wish I had a copy of Windows 1709 install media to see if its the blasted new windows update.