At first I thought it might have something to do with one of the applications I'm using, but after closing it, the problem still remained. It doesn't matter what application I am copying text from or what application I am pasting it to.
After I highlight the text, as soon as I hit the copy, a loud chime goes off, which is quite annoying. If this is likely to have something to do with hardware vs. software, I would be happy to explain what I have. But I can't recall changing anything right before it started happening.
I'm not even sure what zone I should list this under since you don't have any for "haunted equipment."