Monitor breaks briefly but why?

The laptop was always treated well, it never fell down and it was not damaged by water.

Sometimes it happens that when I move the mouse over the screen the picture behaves strangely. Why is that and what can I do about it?

That's what it looks like then.

That looks either for a wobbly contact on the display cable or what more fits your description a GPU error try a new driver but it looks a bit like your gpu is sending you a pension application

Ouch that would be bad

Try the following when it occurs, press the display very carefully whether it will get away or get worse
try new drivers to check the display cable you would have to open the device but you can connect an external monitor if it is in fact the gpu, the error should also occur there

Thank you for your answer

Pressing lightly on the display does not help because this error only lasts for 10 seconds and then everything is normal again

Otherwise I'll try that with another monitor.

If it is only 10 seconds i would exclude the display that would react to certain situations i cross your fingers that it is only a driver or the display controller there would be a new display and controller possibly a new display

What does driver mean and what does display controller mean?

A driver is software due to control your hardware because every device has a driver. A display controller is a component in your leptop it controls your display, it transforms the signals of the graphics card into a picture that we can also see