You will probably get many resposes telling you this is normal. I rode today and my bike did exactly what you desribed. It happens during stop and go traffic the most. There is one mod out there that funnels more air into your radiator by blocking the gap between it and the plastic.
2008 Concours 14
corbin seat, doohickey, agm battery, subframe bolts, progressive springs, stainless brake lines, anti vibration mirrors, wolfman expedition tank bag, panniers, electric outlet for gps, clock, moved license plate, magnetic drain plug, mefo explorer 99 tires, 320 mm Rotor with Galfer green pads front and black on rear