When I turn (slowly) it turns completely and then again after a few seconds it turns completely again
Yes, that's because of mouse sensitivity in the game.
I've already tried it no matter how I adjust the mouse sensitivity in minecraft or in the Windows single digit it is not
Well, in the Windows settings, nothing will work there. More in the game settings. Sometimes there are certain buttons on the mouse to adjust the sensitivity
I have already tried everything
but I just tested it without full screen mode and it moves every 10 seconds once in full and in full screen mode every 4 seconds
Try another mouse out that was synonymous with me sometimes the problem if it is still so it is because of the attitude
Go in your Pc settings on mouse and keyboard and change the sensitivity there