ok, i have really improved my situation: almost no freezings anymore, even in 1600x1200 (i had only one in a long enough time)
it seems the dasung monitor needs his own usb
on my Mainboard i have on the backside 4 USB Ports, and 4 USB3 Ports.
Now i connected Mouse and Keyboard to USB3 (its different controller)
and the only device on the USB2.0 Controller is now the Dasung Monitor.
Its great now! Maybe i buy a PCIe Extension Card with another USB Controller, that would be interesting to try, but for now its working good enough!
(System: Windwos 10, Desktop PC, Geforce GT 720 Graphic Card)
Best wishes
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