HyperPixel 4Inch Square Touch flickering


I have a Problem with my new 4Inch Touch HyperPixel TFT Display. I connected it to my raspi4 and installed the needed packages like its described in the docs. After rebooting i noticed, that the screen was flickering (even on the raspbian boot sequence). I dont know if this is hardware related or i am doing something wrong, so i would appreciate, if someone could give me a hint here. Link to a video with flickering screen is attached.