I restart my MacBook Air OSX 10.8.5 every few days as a routine habit. Twice in the last few months it has come back with the globe (earth) image displayed for 20-30 seconds (I believe it was flashing), then continues on to start normally. See sequence of images.
The first time was immediately after removing some software which displayed my screen via WiFi to a projector at a company (downloaded earlier from the projector mfr. website). Second time nothing particular except that I only had 3GB of remaining disk space at the time.
Should my computer/OS ever display the globe image spontaneously? Is this something that "just happens" sometimes, or should I be looking for a cause?