Sometimes when making a right turn after driving a few miles,other times early in the morning @ start up, the left rear wheel drags hard enough to make the car stop. Almost like if the caliper was binding, but the brakes are fully released and not even hot when i checked them. I thought the bearing may be binding but there in overheating or looseness all around the wheel. I’ve never seen this kind of problem in my life, even when i worked in a car shop for over 9 years. Any ideas??, some guys believe its a bad differential or drive shaft , but why this only happens avery now and then and not all the time???