You probably have Windows 10 set to sleep rather than shut down on your Power Options. See here and turn off fast startup (it makes little difference): https://www.tenforums.com/tutorials/4189-turn-off-fast-startup-windows-10-a.html
Then reboot and see if the software behaves as it should. A computer benefits from being shut down at regular intervals.
Update... found this discussion thread: Re: McAfee and Windows Defender
Here they describe a way of turning off Windows Defender
- Download the McAfee Setup/Install program - Avoids having to go on the internet after McAfee uninstalled
- Uninstall McAfee Total Protection
- Run the McAfee Product Removal Tool
- Install McAfee
Windows Defender is now disabled across reboots.
Damned inconvenient. They need to "fix" their June 15th update!
I believe the solution was yours. After the reinstall, everything is working as it was before the June 15th update.
Yes, this software will automatically turn off Windows Defender when first installed. WD seems to have a new feature that allows it to be partially active with 3rd party software. but that is a discussion for another Windows forum.
If all is OK now please mark your first post as "Answered", thanks and good luck.