Volume control keeps poping up on pc screen?

Guys on my computer screen, every few mins the volume control pops up on the screen. In other words my monitor has speakers built into it, and when you increase the volume you push the volume button on the monitor and the volume control pops up. But problem is I am not pressing anything and the volume control just shows up.
What could be going on? Last time it popped up it stayed on the screen for about 2 hrs. I have scanned for viruses and spy ware, but so far nothing.
Answer #1
the monitor button jammed down inplace ?
Answer #2
Spray or spill anything on the buttons?
Answer #3
Nothing at all fellows, the buttons are up under the monitor on the bottom.