[all variants] Internet connection cycles endlessly

view story

http://ubuntuforums.org – After being away from Ubuntu for a year or so, I returned last night. I upgraded to 12.04 from 10.04. Now, my internet connection just cycles constantly, as if it continuously tries to connect wired, then wireless, then wired, then wireless... I am online (via a wired connection), but sometimes I will lose connection momentarily during one of the "cycles". The wireless symbol (the upward pulsating arcs) will flicker as if it is trying to connect wirelessly, then settle on the two arrows, which I assume to be a wired connection. I'm sure I'm not giving all pertinent information, but (Hardware)