Do you have a cable/sat provider? I've noticed that there's a set resolution in the cable/sat boxes that maintain a certain resolution (for instance, set on 720p or 1080i), and for those signals, changing the channel doesn't bring up the INFO box information. If there's a break in signal as you change channels, or there's a variable resolution selection set on the cable/sat box, the television will see it as a new signal and inform you of the resolution each time you change the channel.
There's no toggle available to turn that off. That may not be the answer you're looking for, but does that help explain?
Is there any way to disable the source information from popping up every time the channel is changed?