Could be the floating brake caliper noise. Wouldn't think stop and go would matter to a wheel bearing.
100% WRONG. I had a wheel bearing go out last year on a cross country trip ( thanks attic rat ) only made a noise at first when at a slow roll turning (85 mph on hwy zero noise) don't remember which direction, by the tIme I got to Bobs place it was popping with every turn of the wheel.
You have a bad rear wheel bearing!