Solara wind

I own a 2004 Toyota Solara coupe. I have been generally happy with the car but had not done much long distance driving. Recently I have noticed an annoying problem. When cruising at highway speeds there is sometimes intrusive wind noise. It sounds like the driver's window is slightly open. I think this is happening when there is a crosswind at the wrong angle. There doesn't seem to be a problem in still air. So car designers please test your creations at an angle in the wind tunnel as well as straight on.