Random white vertical lines after VR-rendering

I have built a system of dark corridors and move the camera through the corridors. I render the whole thing in 360 degrees with Pano MRQ in EXR files. The camera’s depth of field is switched off. Global illumination is Lumen (raytracing leads to a crash with MRQ)
The problem: strange vertical white lines appear in several frames. I have already enlarged the bounds of the cubes from which the corridors are built and increased the motion blur to maximum. Switching from EXR to JPG does not bring any improvement either. Incidentally, the stripes always appear in the same place regardless of the in and out points of the rendering.
Unfortunately, I haven’t really found anything in the forum or online. I hope you have an idea. Thank you very much.