No - the glazing unit has failed. If its a recent fit get them replaced under warranty. If its not get them replaced anyway. If it doesn't really trouble you - leave well alone.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!