This is a topic that comes up fairly regularly. I seem to remember there was some discussion at one stage about an inner section that was free to rotate and was better positioned in a particular way.
For some reason I don't normally have any problem with mine.
I had this problem constantly when I first got my Plus 4. I read about this solution, gave it a go and it's never been an issue since. I'm having a cup of tea in bed at the moment but if more detail is required I can always take a pic later. It's a little plate with holes in it that rotated I seem to remember. The holes should be at the top (or somewhere different from where they are now).
