This is a known problem with the current version. See also:

https://forum.avast.com/index.php?topic=152437.0

I find it amusing that people would suggest that there can be such a thing as an “excessive” level of running scans.

And that’s beside the point. Quite clearly, “excessively” running scans has NOTHING to do with the UI popping up and incorrectly reporting a detection.

Don’t let others convince you that running fewer scans is any kind of solution. Use common sense. Run as many scans as YOU feel comfortable with. It’s YOUR computer.

Reporting the problem here was the right thing to do. You’re clearly not alone, and I imagine it’ll be fixed in the next software update.

-Noel

Edit: Bolding removed as I have been informed that it sounds confrontational.