I will be driving in 4-wheel for a while. When the road condition changes, I shift it out of 4-wheel. About a ½ mile down the road, the light comes on and the car appears heavy as the roads are pretty clear. I stop (I even backed up once in case my wheels were locked) and then moved the shift back into 2-high. The light goes off, everything feels fine – then, while driving at relatively slow speed (ie, 25 mph) the light comes back on (around a ½ mile). It has done this back-and-forth for a couple of miles. I have attempted to switch on the fly and then at a full stop.