Previously I had made this artwork in 2400 x 3000 resolution, but now that I'm trying to increase the document size to 3200 x 4000, parts of the glow for a text is acting up, no matter what I do. There are sharp cuts in the glow.
Also, there is a strange cut in the inner glow of the letter C which looks like the white border around each letter (see image).
Appreciate it if you could tell me what the problem is.