Do you have a machine that, in the past, was configured to use WSUS, but has now been moved and is unable to receive updates because the WSUS settings are bad? I ran into this and decided to document the steps.
After the “Patch Tuesday” updates this month I started having an issues with my PC, having to do with entering sleep or returning from sleep. It would just hang at a black screen, and I would have to hold down the power button to shut down the machine.
After a couple of days, I removed the non-security updates, and the problem seemed to have been resolved. I waited a few days to be sure, and then ran a full backup.