Workplace computer screen flickers strangely (possible screen grabber?)

Good morning

I had 3 computers and notebooks during the years and all of them exhibited strange flickering effect sometimes.

They are all windows machines.

I guess it is due to surveillance software. Could it be?

I have checked services, drivers everything. We have admind rights on these computers. But I did not fins anything.

The IT HQ (where they configure our computers) is located in france and they dont use surveillance (due to legislation) but my local company in …

computer privacy screen workplace