I noticed it shaking at 50mph and above the other night so I pulled over for a look. Wheels, tires, and lugnuts all looked normal but I noticed a little smoke coming off the right front wheel and the wheel was hot. Since I was within a couple of miles of home, I just limped it home. When I got home, the rotor was hot enough to start glowing. My first guess was frozen caliper. I let it sit over night and moved it to the driveway to work on it the next day. I didn't feel any resistance when I moved it, and when I got it off the ground, the wheel turned freely and without any noise. I did some reading on the forum and it looks like others reported the same thing happening. Am I right in suspecting a caliper issue?