Sound notification on startup

[REDACTED]

Today I got some sound notification during Windows 7 booting, as if a threat was blocked. After system loaded and I was able to open Avast window its notification history did not contain anything related to that sound. I reset PC one time and it did not reproduce.
First I send a feedback through "About"\"Submit feedback", but it looks like this feature is not supposed for getting an actual conversation with support team, so that I could send some logs if needed (UI does not inform if logs are sent automatically).
Avast Free 17.9.2322, build 17.9.3761.278.

[TheOwner]

Hello, check Avast shields logs in C:\ProgramData\AVAST Software\Avast\report

[REDACTED]

TheOwner Thanks for advice, nothing interesting there.
I also looked through "log" folder and did not find something related to logging sound output events.
If someone will provide me information about sound logging functionality in Avast Free I will check it. Otherwise, I suppose that it can be left as it is.

[Asyn]

As it didn't happen again, probably just a glitch.