Having had an MGB with balky wheels, I found the best bet was to clean the splines on the wheels and hubs both. I used a wire wheel in my drill motor, and light lubrication afterward. It helped if I kept the splines lightly lubed. No build up of grease to trap dust, dirt, and sand. Normal rotation of the tires, and inspection of the splines at that time, should be sufficient intervals for checking the splines, or once a year at the least.
Scott Stuchell