I don't have a camera like yours, but that red spot looks (in the second roll, not so much the first) like LED-light. Are there indicator lights anywhere in the camera, e.g. viewfinder display or flash-charged indicator?

Next possibility: is there a tear or thin patch in the shutter, e.g. at a fold? Shine a strong torch into the mount and into the viewfinder and see if you can see anything coming through the cloth.