Yeah, what everyone else said. The fix that is most probable to work is for you to take the whole thing apart, clean the components, and put it all back together. If you find damage, try to fix it (like if a plastic mounting part has snapped off, glue it back on). The only things I can think of that cause this is misaligned lenses or dirt somewhere inside.
And if you can't do it, just ship it here and I'll fix it.
