I'm having the same issue here in Sunny South Africa. The bike hates moving slow, which is quite frankly bullshit for a bike designed as a street fighter. If you have to move slow, try and keep it in 2nd gear minimum. I find having it in 1st gear causes the heat generated by the increased RPM to overwhelm the cooling system. That being said, having it in 2nd gear is only a temporary measure. The bike will still overheat in 2nd gear. In addition I find 30 km/h is the minimum required speed for the radiator to keep up with cooling, but again you have to be in 2nd gear - 1st cooks the engine.
On a side note, I think my fan is also giving up the ghost as I don't hear (and feel) the fan coming up when it's approaching the overheating portion of the gauge. Will be taking it to the dealer when I'm on leave to get them to find out what the **** is going on.