GPU Rendering Problem

Hello Blender Community,
I have a small and simple project that I’d like to render with my GPU (mainly because of speed). But something strange happens. When I press render once, it renders the object normally, but for the lighting it renders strange stripes (picture). Then I retry and it gets stuck at the lighting rendering. And every third time I try to render my scene, it works nominally. I played around a bit with the tile size, but it only changes the gap between the stripes. With the CPU everything renders fine.
What could be the cause of this?