OK I was shooting an indoor event inside a large building with flash and surely my SB 900 was turning off from overheating, I was debating if I should just turn the overheat feature off, but I didn't and kind of limped true it.
So I would like to see a PRO flash from Nikon, something like the Metz mecablitz 76 MZ-5 digital flash. The flash should be powered by Nikon En-El3e Li-ion battery used in the D300. The flash should be made with heat sinks and or fan cooling so it can take 60 plus pictures at full power before getting to the shutdown stage (the SB 900 will take app 35 at full power before shutdown). Most shots would be a less than full power and you would then rarely reach the shutdown point.
The Metz sells for app $ 1080.00 incl control module, The Nikon if less than $ 1000.00 should sell OK
In the mean time I think another SB 900 will be purchased or maybe the SB 700 if it gets on the market