The other thing if it has happened in consecutive days in a row, it means you are running an on-demand scan every day, which on a resident on-access antivirus is a much depreciated requirement.
With a resident on-access antivirus like avast, the need for frequent on-demand scans is much depreciated. For the most part the on-demand scan is going to be scanning files that would be otherwise be dormant or inert. If they were active files then the on-access file system shield would be scanning them before being created, modified, opened or executed.
I have avast set to do a scheduled weekly Quick scan, set at a time and day that I know the computer will be on. If for some reason my system wasn't on, no big deal I will catch up on the next scheduled scan.
In all of the time that I have been doing scheduled scans this way I have only once come across message.
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I honestly can't understand the paranoia about the double audio update notice that is flying around, yes it is a bug and in due course will be squashed. If it bugs people so much they can turn off the auto update notification it has nothing to do with security as such. What really is more important is if it fails and you get the pop-up notification about that, even if the auto update notification is turned of.