WebCam Shield, Camera randomly still turning on

Hey, my camera started randomly turning on and off regularly so I think that my pc is compromised somehow (it can either be for video or just microphone).

So i purchased avast and turned the webcam shield to strict, but it still does the same, and if im in a work meeting for example, it turns off randomly as well, like for 1 or 2 seconds, then back on.

How is it possible that something is still using the webcam and going past avast webcam shield? doesnt this make this shield kinda worthless?

thanks

Tried webcam driver update?
Checked for windows updates?