Yea, that is weird, cause it sounds like drivetrain, wheels/tires, but that is NOT usually intermittent.
Like you were speculating, the best thing I can think of is U-Joint/CV Joint that intermittently binds up.
One thing to try, when it happens again, downshift the transmission instead, so that you're doing engine braking, reversing the torque going through the drivetrain. If that cures the problem for the moment, it is at least telling you something and narrowing down the possible cause. I would think if that works, its just another clue for a bad u-joint/cv joint.
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Last edited by Mongo; 10-29-2014 at 03:08 PM.