Ok so I had disabled the Windows Update Service for all my rigs yet somehow MS enables it again automatically. One rig was updated to 1803. I ignored it and the machine was able to mine for a few weeks. Then out of the blue I get DAG errors in Claymore when I try to run all 13 GPUs - they all have 8GB RAM and VM is set to 48GB RAM! I tried a few suggestions and none worked. I could not revert back to 1709 because more than 10 days had transpired since the update. I tried to reset the OS but this just wiped out all programs and still kept it at 1803. So I was forced to reinstall Windows 10 w/ 1709 updates all over again. Took me 5-6 hours to troubleshoot and get it back again.
I searched online and found this link below. The solution is to create a metered Internet Connection. You have to edit the registry. I did this and now if I go to Windows Update it will give an error message trying to download 1803 - see screenshot at bottom of post. So it works great. I've had it with these pesky Windows updates! Rig is working great again. MRGA!!!! (Make Rigs Great Again)https://www.gpuminingresources.com/p/stop-windows-10-automatic-updates.html
"Windows 10 does not make it easy for you to disable Automatic Updates. You may be mining away uninterrupted for months, then you wake up one morning and your rig hasn't submitted any shares for hours. You reboot to find your graphics cards are no longer recognized, your OC settings are deleted, and your mining software immediately error-crashes. Oh great, an unannounced Windows 10 update.
Prevent Windows 10 from automatically installing updates with this quick guide. These changes still allow you to manually check for updates and install them when you're ready to install them."