when it is cold for about 30 seconds the image is slightly distorted after a short time is already good, I have a question faulty scan doubler? or not?
30 seconds after, the picture is excellent and you can use all day without any problems
Problems like this are usually caused by a bad connection somewhere. When things heat up they expand making the connection better.
You can try to find and fix the connection, but I don't know if I'd bother unless it gets worse. 30 seconds isn't that long to wait.