ASUS VG289Q1A does not connect (HDMI) to GTX960 after sleep/startup

I have Kubuntu 22.04LTS, Graphic card is GTX960. I am Using 2 Monitors. The Monitor connected via HDMI (ASUS VG289Q1A) works fine after plug-in, or after changing the settings. But i continuously show HDMI-no connection after sleep, or after power-on of the computer. If I change setting (e.g. framerate) it starts working.
I tried creating xorg.conf, but it didn’t help.