As youv'e seen from this post :-
http://www.honestjohn.co.uk/forum/post/index.htm?t=62707
there is an electronic speed controller in the fan unit which can go short circuit & keep the fan on full speed.
When these fail they get very hot & have probably melted one of the soldered conexions.
The vibration while you are travelling along may just keep the conexion made, then when you stop it looses its conexion. You will either need someone to replace the electronic unit as per the post above or get a new fan unit.
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