intermittent

While driving on the highway, I am getting an intermittent rubbing noise coming somewhere from the front end of my 2011 FJ. Sounds like plastic rubbing a tire gently, but I do not hear it at slower speeds in city driving. Looked underneath and can't see anything that would be causing this...

I did a few searches and read through some short threads and didn't find anything like what I'm seeing. My A/C seems to be running intermittently. I'll have awesome cold air for a bit, then suddenly it's just circulated cabin temps. It doesn't seem to be RPM related, nor outdoor temp related...