Originally Posted by Ken Maltby
Unless you have opened the case I can't see how you could effect the IR path, in any
way. Blowing air on the outside seems an unlikely fix.
The IR senders/receivers are above the screen. If you get something into the gap between the screen and the bezel, you can block one of the IR beams. If you touch the screen elsewhere, it will be detected as if you were touching the screen in two spots simultaneously. Cat hairs work great to trigger this issue.