A lot of times when I open my computer computer (last version of avast free) I found the Background scan disabled, no idea why, and it occurs in all my computers that I have.
The worst thing of that is that ther isn't any warning of that is happening, only a small cross on the avast logo int he window task bar (if you see it)
So the thing is that most of time I'm without antivirus without know it.
It already happen in an all version of avast, but it was fixed.
I've already try to reinstall.
Windows 10 last update.