Graphic is stuttering / jumping - GT730 X11

Moving the mouse or a window over the screen is stuttering. System unusable.
Kubuntu, KDE, Ubuntu X11

I am not shure from when this happens - maybe after installing regular ubuntu updates. The system was good running for 2 month after installing a fresh GT730 card.

Nvidia Treiber: 470.239.06
GT730 with 3 identical Displays (1920x1080, 60Hz)
model : GK208B [GeForce GT 730]
Linux pingu3 5.15.0-101-generic #111-Ubuntu SMP

#top shows nvidia-modeset and Xorg permanent running with 25% load


[ 1928.305] (–) NVIDIA(GPU-0): XXX AAA (DFP-0): connected
[ 1928.305] (–) NVIDIA(GPU-0): XXX AAA (DFP-0): Internal TMDS
[ 1928.305] (–) NVIDIA(GPU-0): XXX AAA (DFP-0): 340.0 MHz maximum pixel clock
[ 1928.305] (–) NVIDIA(GPU-0):
[ 1928.481] (–) NVIDIA(GPU-0): XXX AAA (DFP-0): connected
[ 1928.481] (–) NVIDIA(GPU-0): XXX AAA (DFP-0): Internal TMDS
[ 1928.481] (–) NVIDIA(GPU-0): XXX AAA (DFP-0): 340.0 MHz maximum pixel clock
[ 1928.482] (–) NVIDIA(GPU-0):
(…) this message comes constantly

What is the reason of this behavior?
What does the Xorg-Messages mean?
What is nvidia-modeset doing or try to do?

nvidia-bug-report.log (470.5 KB)

The monitor is detected again and again, please check monitor connection, disconnect one monitor.

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