Some windows jump a little. Direct input interference suspected.

Some windows do it, sometimes. It’s harder to repeat.
The closest apparent suspect is comodo’s direct keyboard allow/block. EDIT: any pop-up setting. The last one was a prog to modify explorer’s memory.

I made a desktop movie. Go at 36’'.

When the mouse moved inside the window, the window moved.
variations:
-moved down-right, then sometimes back left-up.
-moved alone, without mouse over it. This is most of the cases.

I re-imaged the sistem drive and it didn’t go away, all apps installed were chosen carefully and I’m finding nothing suspect, so please help me figure it out completely.