I have been having this problem too for a few months. I schedule a full scan to run very early every Sunday morning. It should be completed by the time I get up, but often doesn’t seem to have run yet. When I check later in the morning, I get the Scan Failed - 99% message. If you click on Details, another full scan immediately starts. What’s up here?
Related to this is that, after this full scan has run, the computer will not restart correctly - either manually or as part of an application update. It gets partway, then just locks up. I need to do a hard power-down, then restart. Once this has been done, the computer will restart correctly when invoked.
