Avast turning off by itself randomly

So i’ve been using avast for years, and now currently using Internet Security.
been recommending it to many people.

But recently a problem popped up, and it happened to two (all) of my desktops. Avast is suddenly turned off (all realtime shields are turned off) in the middle of use (not turned off since booting). i never turned off avast permanently, and sometimes avast wont turn on unless the desktop is restarted. ran bootscan with no results.

Is this a bug?

Im using Windows 10 Anniversary Update
Avast Internet Security 12.3.2280 (build 12.3.3154.2)
Virus Definition 160908

See: https://forum.avast.com/index.php?topic=190625.0